Various cheats

Cheat code:                       Effect:
D D D N S T B R                   INVINCIBILITY
N D N L P                         SPIRIT MODE
T H M S C L S                     ALL WEAPONS
L N J H N S N                     UNLIMITED AMMO
R B C H N                         BIG HEADS
G N N T R T M N T                 FULL MAP
J S N C R P N T R                 TINY ENEMY
C R L S F N D N G S               PURDY COLORS
M T T S T B B N G T N B           LEVEL 1 WARP
D R R N S T B B N G T N           LEVEL 2 WARP
M K J N K                         LEVEL 3 WARP
P T N D N C N                     LEVEL 4 WARP
N N T N D                         LEVEL 5 WARP
T R M N N                         LEVEL 6 WARP
J M D N N                         LEVEL 7 WARP
M R G R T T R R                   LEVEL 8 WARP
S H N T R R N T                   GALLERY
T H T R T M B B                   SHOW CREDITS
J F F S P N G D N B R G           INFINITE LIVES
D N L D D C K                     QUACK MODE
N G L C K C K                     ALL KEYS
J H N T H M S                     LONGHUNTER WARP
S T P H N B R M L                 MANTIS WARP
G R G M L C H C K                 TREX WARP
R N T R C                         CAMPAIGNER WARP
B K S T R D                       FLY MODE
F H G T B C                       SHOW ENEMIES
J H N N C K                       DISCO MODE