Transformice is a multiplayer game where you play as a mouse (or the shaman) that has to get the cheese and then back the mouse hole before time runs out. The main problem with this is that there are several other mice also with the same objective. Throw in physics based puzzles and you have yourself a hilarious time.
The early bird may get the worm, but the second mice gets the cheese.
One thing you learn quickly in Transformice is NOT TO BE FIRST. There are many traps such as cages appearing after 3 seconds over cheese, fake blocks of cheese, or general mob idiocy as 24 other mice race to either side of a teetering balancing beam. Stay sharp!
Beware of flying canonballs
The shaman is the leader mice that is mainly responsible for getting the other mice to the cheese. The shaman can summon blocks, affix joints and pulleys to objects, etc. On some maps there will be two shamans and each mouse hole is color coded to a shaman. In order to get more points the shamans will have to try to get the other players to go into their mouse hole than their rivals'. This usually leads to anarchy as the two shamans immediately try to kill each other or hamper each others progress.
The most common way is with flying canonballs. Then they MAY do it to you too so you gotta stay alert.
By registering an doing very well with returning blocks of cheese back to your holes, you'll be rewarded with unlocks of titles to put underneath your names and clothing that you can dress your mice in.
Right now the game is free to play but is currently having server issues due to player volume. So if you enjoy this game then donating a few bucks to help out this entertaining multiplayer experience.