Deceptive beginner lesson. I actually found the 2 off quite tricky to puzzle out. The last 4 save is weird! Checkmated me twice in a row. Slimmer turtle. Same concept. Not sure we need both, though. Neat concept level. You can do something fairly logical and end up 2 off until you open your eyes and check under the shell. One try. Kinda neat but any of the interesting parts rely on your not noticing that this level uses the oldest trick in the book :) I am celebrating the wrong year? Decade!?? Went faster. Pathologists recommend this one weird trick to win! 
Insights