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Problem: When I create an underground world, everything seems fine, but the heroes can't pass through the gates, even though they are standing right next to each other. Am I missing something? I thought that all I needed to do was set the entrance and exit to the same coordinates, and it would work... So why isn't it working? And what should I do?

Added 2 minutes later
P.S. - When creating the dungeon, I obviously clicked on Large or Lower x3.