Sugestion: change border terrain on stacking area - my hydra got stuck

ok the triggers..
On players, do you have 1 trigger, just set to Player 1, Player 2, etc, or do you actually have 6 different triggers?
thats all i can think of

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All players has their own trigger... and if your hydras are stuck that means they are not stacked yet, if they are stacked then they will just walk right in.