Fun game, good level of difficulty
small criticism in rot 13:
V whfg jvfu IV jnfa'g fvqrjnlf orpnhfr vg pna rnfvyl or zvfgnxra sbe VI. Ohg vg'f abg n ovt qrny orpnhfr lbh whfg arrq gb fjvgpu gur cbfvgvba bs bar oybpx
