Thanks for playing, and you're right. After reading this I checked all 30 boards: on levels 4, 5, 6 and 10 to 13, every keg sits on a trail with no torch on it, so the keg never changes what you strike. From level 15 on, every keg shares a trail with a torch, which is where the puzzles get good. My level picker doesn't check for this yet. The post-jam update will add the rule you describe (every keg has to share a trail with at least one torch) and replace those early boards. I'm holding level changes until AI Jam 5 voting closes.