There are several points on the circle. The player draws a line connecting any two points avoiding the formation of a triangle from one-color lines. If nothing remains as to construct a triangle, the player is losing.

By the way, the game has an Easter egg. Can you find it?

It was developed on the Java using framework libGDX. The game uses shaders for drawing a circle and text. I'm using some tricks for optimizing rendering, e.g. render to texture.

Android release