make a game in 1-bit colour, on a 1px × 1px display with no audio; the minimum (non-zero) feedback that a game could possibly have.

RULES

1-bit colour.
the game cannot use more than two colours. typically these two colours are black and white, but you can use any two colours you want. you cannot combine the two colours (such as shades of grey if the two colours are black and white) but you can rapidly flash between the two colours. you can include a button which swaps between various palettes of two colours, as long as this does not impact gameplay.

1px × 1px display.
the game can be upscaled to any resolution (including fullscreen), but cannot display more than one colour at a time. In other words, the entire game window must always be a single colour.

no audio.
the game cannot use any audio which provides additional feedback to the player. however, you are encouraged to consider making your game accessible to visually impaired players. this can be done by playing a note while the screen is the first colour, and a different note (or no note) when the screen is the second colour, but you must ensure that these notes match the screen state and provide no additional feedback.

no other feedback.
the goal of the game jam is to make a game with no additional feedback. circumventing this (no matter how cleverly) is against the spirit of the game jam. this includes text popups, changing the window size or position, emailing the player, or ejecting the computer's CD drive. you may include other forms of feedback (such as gamepad vibration), but you must ensure that they completely match the screen state and provide no additional feedback.

bend these rules.
abide by the rules where possible, but bend the rules where necessary. some games may not work as well without a menu, or setup page, or settings page, or credits page. some games may be greatly enhanced by displaying an image or random noise in place of one of the two colours, or by drawing a border around the screen. some games may benefit from displaying the player's scores at the end of the game, or putting the score online. all of these things (and anything else you can think of) are fine provided that they do not give additional feedback during the main game, and provided that you believe they are important to the game. making a game that bends the rules is better than not making a game at all.

seizure warning.
if you believe your game might cause problems for people with photosensitive epilepsy, consider adding a warning to the game page. this is more likely to be the case if the game runs in full screen and has rapid flashing.

MANUAL

it's recommended (but not required) to link to or package a manual with your game. the manual can be in whatever format you like (e.g. plain text, pdf, webpage) and can include whatever information you want (e.g. controls, instructions, examples of play, diagrams, photos, audio logs). a game which requires the player to constantly refer to the manual is fine (and so is a game with no manual at all). if you're artistically or literarily inclined, the manual is where you can show off.

clever use of the manual can lead to interesting and complex games.

FAQ

Q: what types of input are allowed?
A: everything! keyboard, mouse, gamepad, webcam, voice, or anything else you can think of. the input can be as simple or as complex as you like!

Q: what types of games are allowed?
A: everything! action games, turn based games, multiplayer games, whatever you want.

Q: what types of platforms are allowed?
A: everything! windows, mac, linux, flash, html5, android, ios, console, or something even more exotic. if you want to program your fridge light to turn on and off no one will stop you!

Q: can I work on this in a team?
A: yes.

Q: is it possible to make a fun game with such ridiculous restrictions?
A: I hope so, but I have no idea! I guess we'll find out.

Q: I don't understand one of the rules!
A: please ask for clarification in the community tab!

Q: what do I do if I have questions that haven't been answered here?
A: please don't hesitate to ask your question in the community tab!