Thanks for asking! It was Level 2 / 100. The card did name the piece: "Rotator A: The rotator inlet is misaligned." The confusing part was that Rotator A's opening looked joined to the curved pipe coming up from START, so I couldn't see what was off. Same card both times, even after rotating it and putting it back. Maybe a clearer look for "connected vs. not" on rotators would help. Also, Play started me straight on Level 2 — not sure if that was intended. Fun puzzle either way!
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Thank you, this is super helpful! You're right: on Level 2 the rotator's opening can look joined even when it isn't, so I'm going to work on a clearer "connected / not connected" look for rotators. Play continues from your last unlocked level, which is why it jumped to Level 2, but I can see why that felt surprising. I just pushed an update with short tips on the first three levels, partly thanks to your feedback!