Hi, yes you can start multiple games and quests, but yes... you have to register for each one. You just click Play, and this will take you to the game site, where you can register.
We are a portal site, so every time you register or play a game, you need to click on the Play button from Bananatic. Quests may not unlock instantly. Sometimes there is a delay until full registration process with whatever games, has been completed (verify the email etc).
Any problems just log a Support TIcket.
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