-Saw once a "double challenge" bug, one anonymous and a second one logged
-Both were asked a challenge probably, and both challenges added as different ones.
+Rematch button (change colors, re-apply randomness params (which should be saved somehow somewhere))
+ --> need a bit more duplicated logic: in Game page, listen for newgame, and add a "launchGame" function
+Will need a 'rematch' field in Game on server