6D32-0FA1 + DC32-04D1 Freeze timer
D430-04A5 Start with 2 health points instead of 3
D030-04A5 Start with 4 health points
D930-04A5 Start with 5 health points
D130-04A5 Start with 6 health points
D530-04A5 Start with 7 health points
D630-04A5 Start with 8 health points
DB30-04A5 Start with 9 health points
FD30-04A5 Start with 15 health points
BAA6-ADA5 Non-fatal injuries do no damage
43C9-6D61 Non-fatal falls do no damage
D4C1-6701 Non-fatal falls do 2 points of damage instead of 1
6DC0-6701 Falls do no damage--except onto spikes (You can get stuck. 
Choose End Game and use a password to start the level over)
C260-A701 + DF6C-DFA0 All enemies have 1 health point
C260-A701 + D46C-DFA0 All enemies have 2 health points
C260-A701 + D76C-DFA0 All enemies have 3 health points
C260-A701 + D06C-DFA0 All enemies have 4 health points
C260-A701 + D96C-DFA0 All enemies have 5 health points
C260-A701 + DC6C-DFA0 All enemies have 10 health points
BA69-ADA1 Enemies drop dead immediately (Using on certain bosses will 
prevent you from moving. Choose End Game and use a password to start the level over)
DFB7-D46E Start on level 2
D4B7-D46E Start on level 3
D7B7-D46E Start on level 4
D0B7-D46E Start on level 5
D9B7-D46E Start on level 6
D1B7-D46E Start on level 7
D5B7-D46E Start on level 8
D6B7-D46E Start on level 9
DBB7-D46E Start on level 10
DCB7-D46E Start on level 11
D8B7-D46E Start on level 12
DAB7-D46E Start on level 13
D2B7-D46E Start on level 14
D3B7-D46E Start on level 15
DEB7-D46E Start on level 16
FDB7-D46E Start on level 17
FFB7-D46E Start on level 18
F4B7-D46E Start on level 19
F7B7-D46E Start on level 20