Why can I not get more then four Chests at the same time? – Rumble Hockey guide

Chests can be opened only one at a time and there are only 4 slots available for the Rumble Chests. When you get 4 Chests from games, all your slots are in use: you need to open one of those Chests before being able to get more. You can of course continue brawling even when all your slots are taken!

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Rumble Hockey Game GUIDE