Referral was added on 21 November 2013 (V1.125) to encourage promotion of Transformice.
You had to enter /parrain in the chat and a window with the link would open. To refer other players, send the link contained in the message. All players who created a game account from this link would automatically be your referee. You got 1 cheese 
(up to a maximum of 100) for every 10 cheese collected by them.
It was removed on 18 March 2021 (V1.630) following the end of Flash on browsers in January 2021.
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