I'm glad to find some people trying to figure level 77 out. It's insanely hard...I think I might be going crazy. Well anyway, I've manage to get close(or at least I think I am). There are just so many different sequences that you can follow. Here's what I've got so far:
1. 123 in bottom left corner
2. 456 in bottom left corner
3. 123 in bottom right corner
4. 123 in bottom left corner
5. 1234 in top right corner
6. 234 in top right(quickly when ice melts...use the 4 directly above the 3)
7. 12356 in bottom left corner
8. 123 in bottom left corner
9. 654 in top middle
10. 864 on the left middle
11. 321 on the top right( 321 sequence using the vanishing 3)
12. 456 on the bottom right
13. this is where I'm stuck(there's a picture below)
Well, I hope we can beat this!