Here are some cheats and tips for the game Hyper Zone.
CODE KEY IN . . . EFFECT . . .
1 D5C4-DFD1 Start with 8 lives
2 DDC4-DFD1 Start with 1 life
3 D76A-D7D5 Restore energy more quickly
4 DD6A-D7D5 Restore energy more slowly
5 4A8A-DFD1 Infinite energy