Transformice, sometimes referred to as TFM, is an online Flash game created by Melibellule (artist) and Tigrounette (programmer). It is a game written in Actionscript 3.0 and the flash-port of Box2D. The basic gameplay was inspired by a previous game by Tig called Aaaah!.
It was released on Steam 30 January 2015. (http://store.steampowered.com/app/335240)