Level 10 (the middle one on the sidebar) seems impossible?
its a tough nut (or in this case, geode :P) for sure
This is the first level that requires a "new" mechanic.
Rot13 Hint: "Fcevat-ybnqvat" n trbqr ol fcyvggvat vg juvyr vg vf oybpxrq ba obgu fvqrf.