the only rule for trainning room is: you cant play with final evolved characters, some exceptions to the rule are hares the brute evo 3, he cant enter this room, also kounok evo 3 and a couple of them
in the normal room there is no restriction so you have to create a deck with 20 or more cards and 1 big character or 3 normal characters, thats all
if you still have problems, post a link of the decklist or the error message
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