################
# GENERAL INFO #
################

They work in the same kind of way as Doom-engine game cheats. (You type them
in in-game.) If you type in a cheat and it doesn't work, try typing it in
again.

"johnromero"   = Toggle invulnerability
"apple2"       = Get trophy, gun, full lives, and full jetpack
"idsoftware"   = Warp to next level
"softdisk"     = Warp to specific level
"angryfan"     = Kill Dave
"shave"        = Take all items
"soundblaster" = Load music pack, see below section for more info

Warning: You will be disqualified from the high scores if you use any of the
cheats (with the exception of "soundblaster").

To enter cheat codes on mobile devices, you can either:
A. Tap the far left of the screen and the far right of the screen with two
   fingers each. (In total, four fingers on the screen.) This will not work on
   iOS devices. Blame Apple for nothing.
B. Tap the "back" button and down on the directional pad at the same time.

With the "softdisk" cheat, inputing a negative number will take you to a warp
zone. For example, inputting "-5" will take you to the warp zone of level 5.
Levels that do not actually have warp zones will take you to the actual level
instead if you try to go to them.

What happens when you try cheat codes from other games?

######################
# SOUNDBLASTER CHEAT #
######################

This "cheat" requires some extra explanation to use properly. Unlike other
cheats, it does not disqualify you and can be inputted from the menu. This
feature allows you to play music assigned to various levels during the game.

After inputting the cheat, it will ask you to load a file. This can be either
a text file containing a list of URLs or a a ZIP file directly containing the
music tracks. Here is a list of valid filenames (in the ZIP format) or keys
(in the text format):

* "level1": Plays during level 1.
* "level2": Plays during level 2.
* "level3": Plays during level 3.
* "level4": Plays during level 4.
* "level5": Plays during level 5.
* "level6": Plays during level 6.
* "level7": Plays during level 7.
* "level8": Plays during level 8.
* "level9": Plays during level 9.
* "level10": Plays during level 10.
* "inter": Plays during the "Good work! Only X more to go!" and "WARP ZONE"
  sequences.
* "win": Plays on the final screen after beating the last level.
* "title": Plays on the title screen. Will play over the demos if this is
  used.
* "titlenoloop": If this is specified instead of "title", will also play on
  the title screen but won't loop. If this is used, the demos will play their
  corresponding level's music as in real gameplay.
* "scores": Plays over the high scores screen. If not specified, the music
  that was already playing before this screen was entered will continue.
* "gameover": Plays while the player's last life is lost and the "GAME OVER"
  message shows up. If not specified, the level's music will continue.
* "warp": Plays during any level's warp zone. If not specified, will play the
  music corresponding to the level that shares the level data with this warp
  zone (for example, level 10's warp zone will play level 1's music).

Music can be in either MP3 or OGG formats. Not all browsers support both
formats, so copies in both formats may be included for wider compatibility. In
that case, OGG will be preferred if the browser supports it with MP3 being
used as a fallback.

In the ZIP format, simply make a ZIP file that contains music files under any
of the above names with the proper file extension depending on the format.

The text format is a series of "[Key]=[URL]" declarations, with the first line
being "$music". There must not be any spaces. The URL can end in ".???", this
will be replaced with ".mp3" or ".ogg" depending on what the browser supports.
For example:

---
$music
level1=https://example.com/Level1Music.???
level2=https://example.com/Level2Music.???
---

Note that the above isn't a valid working example, it's just to give an idea
of how it works. Please use a file hosting service or server that supports
direct, raw links to the files.

For an example music pack, here's a link to a ZIP-format one that uses the
soundtrack from Commander Keen 5 - The Armaggedon Machine:
https://drive.google.com/uc?export=download&id=1ocVNnl5Kh7VWpGAXL7undz4aAoiXqCk_