Why did you move away from the 3 strikes and you lose rule? The check function gives a lot less feedback, and for some of the larger puzzles, you end up trying to find a needle in a haystack to fix a single error, which, I just don't have the patience for hah. Preferred the original system. There's also a side effect that the leaderboard is biased towards those in the 3 strikes era, average solve time definitely increases now I'd suspect.