You have three rooms to find:
8,11: double teleport from 8,16. Spawn an extra kitten using the flag at the entrance.
6,10: you get there through a wormhole in 8,15, which you access from 8,20. Create an extra kitten there and use it to reach the two lower wormholes. You'll need at least three.
15,8: MetaMetaPuzzle posted a hint below.
