Actually you can just click the Full Screen button above the Menu button on Transformice. Or when logging in, click the Full Screen button at the bottom.
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You can just click the fullscreen button above the Menu button. Cheers.
You can now play on fullscreen by downloading the standalone version or by simply clicking the fullscreen button while playing.
Download the standalone version which is located at the login page of the game. Or simply just press the fullscreen button. See related links for more.
Transformice happened in 2010.
I think it can't be turned to fullscreen mode.