From NES Hacker Wiki
Crystalis is an adventure game. The structure and game play is similar to that of Zelda and Final Fantasy. You have woken up in a cyrogenic stasis pod after a nuclear war, and must venture on to the "Tower"!
|03C1||FF||-||Infinite Hit Points|
|How do I use these?|
03C0 - Max Hit Points 03C1 - Hit Points 0704 - Experience Points x1 0705 - Experience Points x256 0711 - Sword/Power Memory (?)