How to play trisentis:

Starting point: You've got an rectangular game court (i.e. 4x4), which consists of different play cards. The face of every card contains a part of an image.

Rule: One move is to choose one field, and to turn over all neighbouring fields, or, in this implementation, to click on a field to turn up all neighbouring fields. If you choose field (2,2), the second field in the second row, you'll get this image:

Clicking now field(3,3), the field itself will stay face up, and all neighbouring fields are turned over, which means (3,2) and (2,3) are turned face down, and the other neighbouring fields are turned face up:

Would you now choose field (4,4), the result will look like this:

Goal of the game: You've won, if you have choosen the right fields, so that all cards are face up and you can see the complete image.