When exploring a castle, my character ended up with "4" on the encounter track. He then needed to backtrack, so the encounter track kept ticking up, but the rules say only roll for an encounter at a "3" on the track. It seemed wrong to never get an encounter again because he backtracked, so I interpreted the rule as you roll for an encounter at any multiple of 3 (so on a "6" or "9" or "12", etc). If you could let me know if I did that right I would appreciate it.
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Thanks for your question! You're basically correct; any time you reach "3" you would reset the track (there's multiple bubbles only so you don't have to erase so much). So at "3" you would have an encounter, and the extra "1" would roll over to the next set of three. Then, like you said, you would have an encounter on multiples of "3", and each room you backtrack adds "1" to the track. Hopefully I've explained that well enough! Feel free to alter any rule to suit your preferences, but it sounds like you're doing what I intended. I'm glad you're enjoying the game!