We pulled them from a database of puzzles, so there probably are a few bugged ones here and there. We've pruned the majority of tactics that are simply broken, but I'm sure that a few questionable ones remain.

I'm in the process right now of going through all of the tactics and adding motif tags along with explanations for the solutions. While I'm doing this, I'll be sure to make sure that all the tactics make sense. Thank you for your feedback!