Thanks for the feedback!
It shouldn't be a bug, You just need some grenades from the shop to blast open the cracked walls. Then you can use the old snake key in the one that has a door inside.
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Thank you for the answer! I'll try that then. Also, I enjoyed the card game, but it would be even more fun if the different opponents would have more varied cards, instead for a whole deck of only Shroom cards. And if there would be a even bigger tournament at some point in some city would be really cool!