Faster movement
Enter "LRRR RLRL RRLL RLRR" as a password.

Less damage
Enter "LRRR RLLL RLLL LLLR" as a password.

Higher jumps
Enter "LLRR RRRR LLRR LLLR" as a password.

Faster opponents
Enter "LRRR RRLL LLRR RRLL" as a password.

Slower opponents
Enter "LLRR RLRR RLLR RLLR" as a password.

Stronger enemies
Enter "LLRR RRLR RRLL LLLL" as a password.

Reverse controls
Enter "LRRR RRRL RLLR RLLL" as a password.