Merge branch 'master' of gh:fragglet/freedoom

manual/Makefile

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+
+all: freedoom-manual.pdf
+
+freedoom-manual.pdf: manual.adoc
+	asciidoctor-pdf -a toc manual.adoc
+

manual/README.adoc

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+
+`manual.adoc` contains Freedoom's manual. It is intended to be built
+as a PDF file but can also be viewed in HTML format. To build as a
+PDF, https://asciidoctor.org/[Asciidoctor] is required, since it has
+superior PDF output to the Asciidoc reference implementation.
+

manual/manual.adoc

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+= Freedoom Manual
+
+Welcome to Freedoom, a complete game that is free and open source software.
+Freedoom is made available under the modified BSD license, meaning that
+anyone is free to share it, modify it and reuse parts of it. For more
+details, see the <<reusing,reusing section>>.
+
+image::../graphics/titlepic/titlepic.png[Freedoom Title Image,align="center",width=380,pdfwidth=50vw]
+
+== Installing Freedoom
+
+Freedoom is distributed as two files named `freedoom1.wad` and `freedoom2.wad`
+which contain the artwork, levels, music and sound effects that make up the game.
+To be played it needs to be paired with a source port. Fans of the original Doom
+games have created a number of these; the Doom Wiki's
+https://doomwiki.org/wiki/Source_port[source ports page] has a comprehensive
+list. The following are some good default suggestions:
+
+* https://zdoom.org[GZDoom] is a modern source port that includes various
+  features such as a hardware renderer.
+* https://www.chocolate-doom.org/wiki/index.php/Crispy_Doom[Crispy Doom]
+  is a more minimalist source port that retains an "old school" feel.
+
+Setup depends on the source port you use, and it's best to refer to the
+instructions for that source port. Generally though, you can try one of the
+following:
+
+* Place the Freedoom `.wad` files into the same folder as the source port
+  before launching it. They may be automatically detected.
+* If launching from the command line, try
+  eg. `my-favorite-port -iwad freedoom1.wad`.
+
+Freedoom is split into _Freedoom: Phase 1_ (`freedoom1.wad`) and
+_Freedoom: Phase 2_ (`freedoom2.wad`). _Phase 1_ is split into four separate
+chapters of eight levels each, while _Phase 2_ is a single, 30 level campaign.
+This gives 62 levels to play through, and there are also secret levels -- if
+you can discover how to reach them.
+
+[[menus]]
+== Using the Freedoom Menus
+
+Freedoom's menus are fairly self-explanatory but here are some brief
+instructions. The main menu can be brought up at any time by pressing the
+_Esc_ key on your keyboard.
+
+image::images/menu-mainmenu.png[Freedoom Main Menu,align="center",width=380,pdfwidth=50vw]
+
+[cols="1,4",width="90%",align="center",valign="middle"]
+|==========================
+| <<newgame,**New game**>> | Start a new game, abandoning the current game (if you're
+already playing).
+| **Options** | Brings up the options menu. The appearance of this menu
+and the available options depend upon the source port you're using.
+| <<savegame,**Load Game**>> | Load a saved game.
+| <<savegame,**Save Game**>> | Save your current game, so that you can continue playing
+later.
+| **Read This!** | Brings up a help screen showing a description of the
+items you'll encounter in the game.
+| **Quit Game** | Finish playing and return to the operating system.
+|==========================
+
+[[newgame]]
+=== Starting a new game
+
+To start a new game, press _Esc_ to bring up the main menu, and choose
+_New Game_.
+
+When starting a new game, you may be prompted to choose which chapter to
+start playing.
+
+image::images/menu-chapter.png[Freedoom Chapter Menu,align="center",width=432,pdfwidth=50vw]
+
+If you're new to the game, start with _Outpost Outbreak_, the first
+chapter (and easiest). Once you finish one chapter, you can move on to
+the next. If you're bored with the chapter you're playing or stuck, you
+can always try playing a different chapter instead. There's no requirement
+to play chapters in order.
+
+After choosing a chapter, you need to pick a skill level. Skill level
+affects several factors in the game, most importantly the number of
+monsters you'll encounter.
+
+image::images/menu-skill.png[Skill Selection Menu,align="center",width=473,pdfwidth=50vw]
+
+[cols="1,3,8",width="90%",align="center",valign="middle"]
+|==========================
+| 1 | **Please Don't Kill Me!** | The easiest skill level. This is
+effectively the same as _Will This Hurt?_, except that damage is halved.
+| 2 | **Will This Hurt?** | Easy skill level, a good choice if you're
+finding _Bring on the Pain_ too challenging.
+| 3 | **Bring on the Pain.** | The default skill level.
+| 4 | **Extreme Carnage** | A more challenging skill level, suited more
+for experienced players and people in search of a challenge.
+| 5 | **INSANITY!** | **Not Recommended**. This is equivalent to
+_Extreme Carnage_ except that monster attacks are up to twice as fast,
+and killed monsters come back to life after around 40 seconds.
+|==========================
+
+[[savegame]]
+=== Loading and saving the game
+
+It is a good idea to save the game regularly -- for example, at the start
+of each new level. You may also want to save the game after completing a
+challenging section of a level so that you do not have to repeat it again
+if you die.
+
+image::images/menu-save-game.png[Save Game Menu,align="center",width=473,pdfwidth=50vw]
+
+To save the game, press _Esc_ to bring up the menu, select _Save Game_ and
+choose a slot to save in. Type a description for the save game and press
+_Enter_. Some source ports have a limited number of slots, in which case you
+will have to overwrite an existing saved game once there are no more slots
+available. For the same reason it's a good idea to write a good description
+for your saved game. Include the level number and something descriptive of
+where you've reached; for example, "C1M3 - Blue Key Door".
+
+The _Load Game_ menu usually looks largely identical to the _Save Game_
+menu. To restore your saved game, simply select _Load Game_ from the main
+menu and choose your saved game.
+
+If you find yourself saving the game often, you may want to use the
+_Quicksave_ feature. Press _F6_ during play to quicksave. The _Save Game_
+menu appears as usual; choosing a slot makes that your quicksave slot.
+Pressing _F6_ again in the future will overwrite your quicksave slot with
+just a couple of keystrokes. If you die you can also restore your
+quicksave slot by pressing _F9_.
+
+=== Quitting the game
+
+When you're finished playing Freedoom, press _Esc_ to bring up the main
+menu and select _Quit Game_ to exit. You may want to select _Save Game_
+first to save your progress so that you can return to where you left off
+next time you play.
+
+=== Keyboard shortcuts
+
+The following are some useful keyboard shortcuts that can save time
+accessing common menu functions.
+
+[cols="1,2,8",width="90%",align="center",valign="middle"]
+|==========================
+| **Esc** | <<menus,Menu>> | Bring up the main menu.
+| **F1** | Help | Bring up the help screen that shows information about the
+in-game items.
+| **F2** | <<savegames,Save>> | Bring up the _Save Game_ menu.
+| **F3** | <<savegames,Load>> | Bring up the _Load Game_ menu.
+| **F4** | Volume | Bring up a menu to control volume levels.
+| **F6** | <<savegames,Quicksave>> | Save the game to your _quicksave_ slot,
+which saves time if you're repeatedly saving your progress while you play.
+| **F7** | End Game | End the current game and return to the title screen.
+| **F8** | Messages | Toggles between showing or hiding the on-screen
+messages shown when you collect an item.
+| **F9** | <<savegames,Quickload>> | Load the game from your _quicksave_ slot.
+| **F10** | Quit Game | Quit the game and return to the operating system.
+| **F11** | Brightness | Toggle the on-screen brightness level.
+|==========================
+
+== How to Play
+
+image::images/c5m1-sshot.png[Freedoom Screenshot,width="640",pdfwidth="70vw",align="center"]
+
+Freedoom is a real-time first-person shooter (FPS). You'll be exploring a
+series of levels, in each one trying to find the way to the exit. An
+assortment of monsters will try to stop you, and you'll need to use weapons
+to defend yourself.
+Portions of the levels may be inaccessible until you find a particular key, or
+find a switch to open a locked door. This gives a puzzle element to the game in
+addition to the action.
+
+By default, the keyboard cursor keys will move forward and backward, and turn
+left and right. The _Control_ key fires the current weapon, and the spacebar
+will open doors and activate switches. All source ports allow you to rebind
+these keys to a setup that you find more comfortable. You'll also want to look
+into using the strafe (sidestep) and run keys to better control over your
+movement.
+
+If you haven't played Freedoom before, take a few minutes when you start the
+game to get familiar with the controls, and reconfigure controls as you find
+makes it more comfortable to play. Practice moving around and firing the
+weapon. You may encounter some low-level monsters, but those encountered in
+the first level do not present much of a challenge and they're a good
+opportunity to practice taking shots at.
+
+Within the game you'll encounter various collectible items and power-ups.
+These will typically give you more <<ammo,ammunition>> for your weapons, more
+<<health,health>> or more <<armor,armor>>. You can also find <<weapons,new
+weapons>> and some <<specialitems,rarer power-ups>> which give you special
+abilities. Picking something up is a simple matter of walking over it -- an
+on-screen message and a brief flash of the screen indicate that you've done so
+successfully. If you don't pick it up, it's likely you don't need it right
+now (for example, you can't pick up a health pack when you already have 100%
+health).
+
+=== The Status Bar
+
+At the bottom of the screen, you'll see the status bar, which is divided into
+the following sections:
+
+image::images/status-bar.png[Freedoom Status Bar,width="640",pdfwidth="70vw",align="center"]
+
+[cols="1,6",width="90%",align="center",valign="middle"]
+|==========================
+| **Ammo** | Number of units of <<ammo,ammunition>> remaining for the current
+weapon.
+| **Health** | If this reaches zero, you're dead! See the
+<<health,health section>> for power-ups you can find to replenish your health.
+| **Arms** | Which weapons you've found so far. Check out the
+<<weapons,weapons section>> for more information.
+| **Freedoomguy** | A quick visual indication of how your health is.
+| **Armor** | The more armor you have, the less your health will suffer if
+you're injured. See the <<armor,armor section>> for more information.
+| **Ammo counts** | How much you're carrying of each of the <<ammo,four types of
+ammunition>>, along with the maximum of each you can carry.
+|==========================
+
+[[weapons]]
+=== Freedoom's Weapons
+
+You start the game with only a handgun, 50 bullets and your fists to fall back
+on once they run out. You'll want to find yourself some better weaponry as
+soon as possible.
+
+[options="header",cols="4,1,7,3,2",valign="middle"]
+|==========================
+| Weapon | Key | Description | | Ammo
+| **Fist** | 1 | If you have no ammunition, you can always fall back on punching the
+monsters with your bare hands. | | None
+| **Angle Grinder** | 1 | Designed for cutting through metal, the angle grinder
+also works well as a melee weapon for cutting through flesh. | 
+image:../sprites/csawa0.png[Angle Grinder] |
+None
+| **Handgun** | 2 | Your starter weapon. A few shots will take down low-level
+monsters but it's best to upgrade before taking on any tougher opponents. | | Bullets
+| **Pump-action Shotgun** | 3 | The main "workhorse" weapon; fires seven pellets
+in a tight cluster and is effective over both short and long ranges against
+low- and medium-level monsters. |
+image:../sprites/shota0.png[Pump-action Shotgun] |
+Shells
+| **Double-barrelled Shotgun** | 3 | Twice as powerful as the pump-action shotgun
+but less effective at long ranges; good at short range against crowds of
+enemies. |
+image:../sprites/sgn2a0.png[Double-barrelled Shotgun] |
+Shells
+| **Minigun** | 4 | Conceptually like a faster version of the basic handgun, but
+eats ammo much more quickly. |
+image:../sprites/mguna0.png[Minigun] |
+Bullets
+| **Missile Launcher** | 5 | Fires exploding missiles which are effective against
+higher-level monsters. Be careful not to get caught in the blast! |
+image:../sprites/launa0.png[Missile Launcher] |
+Missiles
+| **Polaric Energy Cannon** | 6 | Produces a continuous stream of polaric energy
+projectiles which are very effective against higher-level monsters. |
+image:../sprites/plasa0.png[Polaric Energy Cannon] |
+Energy
+| **SKAG 1337** | 7 | Experimental weapon that launches a energy ball that does a
+huge amount of damage, plus also damages other enemies in the vicinity.
+Slow to fire, but incredibly powerful. |
+image:../sprites/bfuga0.png[SKAG 1337] |
+Energy
+|==========================
+
+Pressing the numbered key on the keyboard switches to the given weapon (if it
+has been picked up!). Apart from the melee weapons, each weapon consumes a
+certain type of ammo, and you should be careful to look out for more ammo as
+you're exploring.
+
+[[ammo]]
+[options="header",cols="2,1,1",width="50%",align="center",valign="middle"]
+|==========================
+| Ammo type | Small | Large
+| **Bullets** |
+image:../sprites/clipa0.png[Ammo Clip] |
+image:../sprites/ammoa0.png[Ammo Clip]
+| **Shells** |
+image:../sprites/cella0.png[Small Energy Recharge] |
+image:../sprites/celpa0.png[Large Energy Recharge]
+| **Missiles** |
+image:../sprites/rocka0.png[Missile] |
+image:../sprites/broka0.png[Crate of Missiles]
+| **Energy** |
+image:../sprites/cella0.png[Small Energy Recharge] |
+image:../sprites/celpa0.png[Large Energy Recharge]
+| **Backpack** |
+- |
+image:../sprites/bpaka0.png[Backpack]
+|==========================
+
+The backpack item is a special item that contains several of every ammo type
+and doubles the maximum amount of ammo you can carry.
+
+[[health]]
+=== Health
+
+You die if your health reaches 0%. You'll find health bonuses around the
+levels which can restore you back to 100% health; 1% health bonuses can take
+you over 100% and up to 200% health.
+
+[options="header",cols="1,1,1,1",width="50%",align="center",halign="center"]
+|==========================
+| 1% | 10% | 25% | 100%
+| image:../sprites/bon1a0.png[1% Health Bonus] |
+image:../sprites/stima0.png[Small Health Pack] |
+image:../sprites/media0.png[Large Health Pack] |
+image:../sprites/soula0.png[Overdrive Sphere]
+|==========================
+
+[[armor]]
+=== Armor
+
+You start with 0% armor and can increase this up to 200% by collecting bonuses.
+
+[options="header",cols="1,1,1",width="50%",align="center",halign="center"]
+|==========================
+| 1% | 100% | 200%
+| image:../sprites/bon2a0.png[1% Armor Bonus] |
+image:../sprites/arm1a0.png[Light Armor Vest] |
+image:../sprites/arm2a0.png[Heavy Armor Vest]
+|==========================
+
+Normal armor absorbs one third of damage you receive. For example, suppose
+you're hit by a missile that reduces your health from 100% to 50%. If you're
+hit by the same missile while wearing 100% armor, your health will reduce to
+only 66%, but you'll lose 16% armor.
+
+The heavy armor vest has slightly different behavior: in addition to being
+worth 200% armor, it also absorbs half of all damage. For this reason, it's
+a very good idea to get your hands on a heavy armor vest if you can locate one.
+
+[[specialitems]]
+=== Special Items
+
+You may also encounter any one of these special items while exploring:
+
+[cols="2,1,5",width="80%",align="center",valign="middle"]
+|==========================
+| **Keys** |
+image:../sprites/bkeya0.png[Blue Key]
+image:../sprites/bskua0.png[Blue Key]
+image:../sprites/rkeya0.png[Red Key]
+image:../sprites/rskua0.png[Red Key]
+image:../sprites/ykeya0.png[Yellow Key]
+image:../sprites/yskua0.png[Yellow Key] |
+Allow you to open certain locked doors and activate locked switches.
+Usually essential to be able to progress, although they sometimes allow
+access to secret areas.
+| **Night Vision Goggles** |
+image:../sprites/pvisa0.png[Night Vision Goggles] |
+Allow you to see in the dark for a limited time.
+| **Ultra-Overdrive Sphere** |
+image:../sprites/megaa0.png[Ultra-Overdrive Sphere] |
+Maxes you out to 200% health and armor.
+| **Tactical Survey Map** |
+image:../sprites/pmapa0.png[Tactical Survey Map] |
+Unlocks all areas of the map, including some secret areas that may not be
+immediately visible.
+| **Hazard Suit** |
+image:../sprites/suita0.png[Hazard Suit] |
+Protects you from the harmful radiation of damaging floors, for a limited
+time.
+| **Strength Power-Up** |
+image:../sprites/pstra0.png[Strength Power-Up] |
+Increases your health back to 100% and enhances your fists to 10x their
+normal damage, until the end of level.
+| **Stealth Sphere** |
+image:../sprites/pinsa0.png[Stealth Sphere] |
+Makes you almost invisible for a limited time.
+| **Invulnerability Sphere** |
+image:../sprites/pinva0.png[Invulnerability Sphere] |
+Makes you immune to all damage for a limited time.
+|==========================
+
+=== Enemies
+
+The levels are filled with monsters who have no other goal apart from stopping
+you from completing your mission. Here's a selection of some of these monsters
+who you can expect to encounter.
+
+[frame="none",cols="2,6,2",valign="middle",grid="none",align="center",width="90%"]
+|==========================
+| **Zombie** |
+These undead creatures are armed with a pistol and intent on your destruction.
+Drops a clip of bullets when killed. |
+image:images/monster-zombie.png[Zombie,100,100]
+| **Shotgun Zombie** |
+These guys traded their pistol for a shotgun and pack far more of a punch.
+Drops a shotgun when killed. |
+image:images/monster-shotgun-zombie.png[Shotgun Zombie,100,100]
+| **Minigun Zombie** |
+As soon as you're in sight of one of these, he'll lock on with his minigun and
+keep on firing until you're dead. It's best to take cover quickly or take him
+out. Drops a minigun when killed. |
+image:images/monster-minigun-zombie.png[Minigun Zombie,100,100]
+| **Serpentipede** |
+Serpent footsoldiers of the alien invasion. Let them get close and they'll
+tear you to shreds; at a distance they'll instead rain down fireballs. |
+image:images/monster-serpentipede.png[Serpentipede,100,100]
+| **Flesh Worm** |
+Tough and fast-moving, these worms attack at close range and take several
+shotgun blasts to take down. It's best to keep back. |
+image:images/monster-flesh-worm.png[Flesh Worm,100,100]
+| **Stealth Worm** |
+These flesh worm variants have been given stealth abilities which make them
+practically invisible. |
+image:images/monster-stealth-worm.png[Stealth Worm,100,100]
+| **Deadflare** |
+Floating skulls which charge from a distance. |
+image:images/monster-deadflare.png[Deadflare,100,100]
+| **Summoner** |
+These mobile Deadflare production factories will ensure you always have more
+work to do. |
+image:images/monster-summoner.png[Summoner,100,100]
+| **Trilobite** |
+These flying orb-like creatures spit fireballs and bite if you get too
+close. |
+image:images/monster-trilobite.png[Trilobite,100,100]
+| **Pain Bringer** |
+100% muscle, these guys take at least three rocket blasts to take down, and
+while you're trying they'll shower you with energy projectiles. |
+image:images/monster-pain-bringer.png[Pain Bringer,100,100]
+| **Pain Lord** |
+If the Pain Bringer wasn't tough enough, this one will take five rocket
+blasts. |
+image:images/monster-pain-lord.png[Pain Lord,100,100]
+| **Dark Soldier** |
+Fast moving, tough, and fires heat-seeking missiles. Do not get into a boxing
+match with one of these guys. |
+image:images/monster-dark-soldier.png[Dark Soldier,100,100]
+| **Flame Bringer** |
+If he's not setting you on fire, he's undoing all your hard work by bringing
+his friends back from the dead. |
+image:images/monster-flame-bringer.png[Flame Bringer,100,100]
+| **Combat Slug** |
+These genetically-engineered super-slugs have been fitted with long distance
+flame throwers, practically making them into living, slithering tanks. |
+image:images/monster-combat-slug.png[Combat Slug,100,100]
+| **Technospider** |
+These spider creatures have been equipped with polaric energy cannons, making
+them a deadly challenge. |
+image:images/monster-technospider.png[Technospider,100,100]
+| **Large Technospider** |
+This tank on legs is equipped with a rapid-fire minigun and will take a lot
+of effort to bring down. |
+image:images/monster-large-technospider.png[Large Technospider,100,100]
+| **Assault Tripod** |
+The ultimate blend of military technology and genetic engineering, these
+three-legged creatures are fast-moving, heavily armored and equipped with a
+missile launcher that you'll want to avoid. |
+image:images/monster-assault-tripod.png[Assault Tripod,100,100]
+|==========================
+
+=== Using the map
+
+When exploring Freedoom's levels, it is sometimes possible to get lost,
+especially if the level is particularly large or complex. Fortunately, the
+map is available to help you find your way. Press the _Tab_ key during play to
+bring up the map.
+
+image::images/map.png[Map Screenshot,width="640",pdfwidth="70vw",align="center"]
+
+Your current position and orientation are shown by a white arrow.
+Areas of the map are usually color coded as follows:
+
+[frame="none",cols="1,4",valign="middle",align="center",width="60%"]
+|==========================
+| **Red** | Walls (or possibly secret doors)
+| **Yellow** | Changes in ceiling height, including doors.
+| **Brown** | Changes in floor height (eg. steps)
+| **Grey** | Undiscovered areas (not normally shown, but may be revealed
+if the <<specialitems,Tactical Survey Map>> item is discovered).
+|==========================
+
+While using the map, the game continues as normal, so it is wise to find a
+safe place before activating it, to avoid being ambushed by monsters. Normal
+controls continue to work as usual, but the following additional keys are
+available:
+
+[frame="none",cols="1,4",valign="middle",align="center",width="80%"]
+|==========================
+| **Tab** | Toggle Map
+| **-** | Zoom out
+| **+** | Zoom in
+| **0** | Maximum zoom out
+| **F** | Toggle whether the map follows the player. When disabled, the
+cursor keys can be used to pan the view of the map around independent of
+your current position.
+| **G** | Toggle map grid
+| **M** | Add a map bookmark at the current location.
+| **C** | Clear all bookmarks.
+|==========================
+
+=== Environmental Hazards
+
+If the monsters weren't enough, the environment itself poses hazards which
+can hurt or even kill you!
+
+[frame="none",cols="1,4,2",valign="middle",grid="none"]
+|==========================
+| **Barrels** |
+These exploding barrels litter many of the levels. Several shots with a pistol
+are usually enough to make them detonate, damaging anything in their immediate
+vicinity. Make sure when engaged in combat to never stand too close, or a stray
+shot from an enemy may cause one to explode in your face! Be aware too of the
+potential for chain reactions when several barrels are clustered together. |
+image:images/hazard-barrels.png[Barrels,150,150]
+| **Damaging Floors** |
+Red-hot lava and radioactive sludge are just two of the types of damaging floor
+you can encounter in Freedoom's levels. If walking over it is necessary, try to
+find yourself a <<specialitems,hazard suit>>, but be aware that it will only
+protect you for a limited time. |
+image:images/hazard-slime.png[Radioactive slime,150,150]
+| **Crushing Ceilings** |
+Many of the levels have been rigged with traps and this is just one of them.
+These moving ceilings are often placed above tempting-looking items. Be very
+careful not to get caught beneath one, or it will quickly crush you into a
+paste! |
+image:images/hazard-crusher.png[Crushing Ceiling,150,150]
+|==========================
+
+=== Tactical tips
+
+If you're struggling with the difficulty of the game, one option is to change
+to an easier skill level. Alternatively, you can try some of these tactical
+suggestions:
+
+* Firstly, put some time into setting up your controls. Most players find that
+  a mouse and keyboard combination is the most effective, where the mouse is
+  used to turn while the keyboard is used to move around. In particular, make
+  sure that you have set up strafe (sidestep) keys. Many of the enemies in
+  the game launch projectiles which must be dodged. Sidestepping these
+  projectiles is an important skill to learn. You'll know you've mastered this
+  skill when you can easily circle around an enemy and dodge its projectiles
+  while simultaneously keeping your weapon trained on it.
+
+* Take cover! Monsters only attack when you're in their line of sight. You'll
+  want to find walls, pillars and other forms of cover you can hide behind
+  while your weapon reloads. This advice is particularly important when
+  facing certain monsters which can "lock on" to you (Minigun Zombie; Flame
+  Bringer); hiding from these is a crucial skill.
+
+* Many of the levels are littered with exploding barrels. While these can pose
+  a danger to you, they're equally dangerous to your opponents. A single,
+  well-timed shotgun blast aimed at a barrel can take down several enemies at
+  once. One barrel explosion can trigger another, so it can sometimes set off
+  a chain reaction that takes down a whole crowd -- but be careful that
+  doesn't include you!
+
+* If a monster gets injured by another monster, it'll retaliate against the
+  one that injured it. If faced with a crowd of enemies, an effective strategy
+  can be to stand in just the right place so that those at the back shoot
+  those at the front. Do it right and they'll spend more time fighting each
+  other than fighting you, and the survivors will be significantly weakened.
+  Be aware though, that a monster cannot be injured by a projectile launched
+  by another of the same species.
+
+[[wads]]
+== Playing with fan-made WADs and mods ==
+
+TODO: Write this section.
+
+== Contributing to Freedoom ==
+
+TODO: Write this section.
+
+[[reusing]]
+== Reusing portions of Freedoom ==
+
+TODO: Write this section.
+
+== Cheats ==
+
+TODO: Write this section.
+