Color Flood

Somewhat longer guide:
The object of the game is to organize the mixed-up path so that all colors flow properly from the sources to the sinks. The sinks are colored with the color they should receive, and will display a hole when no color is flowing into them, or a darker ring when the color is not the right one. Since the colors darken as they get further from the sources, it is sometimes necessary to make a longer route to get the shade of the color exactly correct. Combining the colors is done using the RGB model. (If you're not familiar with it, just play with the game a while, it's not too hard to get the hang of it.) Note that there is some space between the tiles where clicking won't do anything; this is to make sure you don't click on the wrong tile in normal or hard difficulties. Clicking the middle mouse button on a sink will tell the (smallest) distance it is to a source of each color. Pressing the "I" key will give some information about the tile distribution.
The basic settings should make for easy games, but you can make things harder for yourself by using the options displayed above the play area:

• Difficulty:
  With easy difficulty, just go ahead and click along until you get everything right. With normal and hard, you're only allowed to rotate each tile once — when you start on another tile, the previous one is set, and you can't rotate it anymore! Normal difficulty shows you which tiles are untouched, active or set, on hard you have to remember this yourself. On normal difficulty, pressing the "Oops" button lets you change a tile that you've already set.
• Size:
  The number of tiles on an edge. The minimum, three, is pretty trivial; 5-10 is usually a decent challenge, but you can go up to twenty, which is pretty insane. This value will always be followed, unlike the two below.
• Sources:
  The number of sources from which color will flow. This number is not always strictly enforced, but the board layout generator will usually make this number of sources. Overly high numbers won't be accepted, since there needs to be some room for the other kinds of tiles as well.
• Empty tiles %:
  The percentage of space the layout generator will try to leave open. This is likely to be at least a bit off, usually leaving less space open than wanted. Minimum is 2%, maximum is 50%.
• Wrap:
  For some extra challenge, use this option. When wrapping is on, the board "wraps", or is linked from the sides to the opposite sides (and a bit strangely around the corners). You can move the board around with the keys "G","Y","U","J","N", and "B" and reverse the movement direction with "R".

Known issues:
Mainly to do with exact display of colors. The fact that pure green seems a lot brighter to the human eye than pure blue would require some correction, but properly balancing this with the darkening by distance from source, and combining different values of color components is difficult. Additionally, you need to consider that colors display differently on different monitors, and that surrounding lighting changes the way they are perceived. Some options for how colors are displayed may be added later.
Small boards with the current layout algorithm can sometimes be empty, trivial or not really follow the rules that the layout tries to use. Different layout algorithms are easy to add, but more difficult to create.

Color Flood was created by Otto Martin as a refinement of the games Zen Loops and Colourshift. It is under the Creative Commons Attribution-ShareAlike (CC BY-SA) license.
Thanks to Sampo, Codez, Daemou, MV, KoneV, ozie and Diamondshade for ideas, advice and testing.
There's also a page of commentary, design decisions, and future ideas.
This is game version 0.0.

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