Transformice is a free-to-play game about mice who are trying to get to the cheese and then to bring it back to the mouse hole where their significant other is waiting for it.

To do this the mice need to try to work together by helping each other. However, overzealous players who are trying to reach the cheese, ahead of other players, could cause difficulties for other mice by putting them in dangerous situations. On some levels the mice are able to transform themselves into boxes and planks and thus aid others in getting over obstacles, however this strategy rests on the assumption that some players have to choose to give up on getting the cheese on that level. Another variation of the game is when one player is appointed as shaman, a mouse that can build things, and the shaman's job is to try to help other mice get the cheese by supplying means to overcome the obstacles.

There are further variants of the game available with altered rule sets and community designed maps.

In-game store sells skins and shaman items that can be built when player is chosen by the game to be a shaman.

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