this is awesome! i liked the math/combining mechanic, it brought another side to the puzzles! i think i got stuck, not sure if its a bug but when i got to 7, 8, 9 and the 7 7 4, I already pushed the 7 and made it disappear (before waking up all the sheep) so when i reset i always only had 8 and 9 and 7 and 4, and couldnt figure out how to get #3 from there. great stuff!