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Level 22:

1.) first ant (John): surfer and digger
2.) second ant: stop in the middle of the digged tunnel
3.) next ant (Paul): surfer, next ant (George): surfer
4.) let Paul and George walk alone
5.) next ant: stop left from the door
6.) next ant coming out of the door: create two ladders right from the door (as near to the door as you can)
7.) with Paul dig on "A".
8.) create three ladders from
a to b,
c to d,
e to f
9.) dig on right from f, so you can walk through the wall
10) free John digging to the left, if he can follow Paul to the bottom, everything is okay
11) create ladders from g to h, i to j, k to l
12.) create a third ladder on the two ladders you build on 6. to free all ants
13.) if you pass the stones, create two ladders from B to C or use the same trick building ladders you use at 8. and 11.

You have twice as many ladders as you need, create more ladders, if you fail.