There are two versions of this game. If the first code doesn't work, try 
the other code

C2C9-4E2C / C2C1-4A9C Infinite lives
D568-C34D / D568-C33D Start with 8 lives
DC68-C34D / DC68-C33D Start with 11 lives
DE68-C34D / DE68-C33D Start with 16 lives
FB68-C34D / FB68-C33D Start with 26 lives
7468-C34D / 7468-C33D Start with 51 lives
0868-C34D / 0868-C33D Start with 76 lives
1768-C34D / 1768-C33D Start with 100 lives
EE65-C37E / EE66-C27E When your last Kong is hit, the other one returns--must 
have had both Kongs at some point in the level for code to work--reset if you get stuck
1DCC-CA7A / 1DCA-C2EA Almost invincible--Switch off if you get stuck
DBC1-3D6D + DCC1-34AD / DBC9-340D + DCC1-3D6D 10 bananas needed for an extra life
F6C1-3D6D + FBC1-34AD / F6C9-340D + FBC1-3D6D 25 bananas needed for an extra life
7FC1-3D6D + 74C1-34AD / 7FC9-340D + 74C1-3D6D 50 bananas needed for an extra life
0CC1-3D6D + 08C1-34AD / 0CC9-340D + 08C1-3D6D 75 bananas needed for an extra life
1D6B-3FDD + 196A-333D / 1D6B-3D6D + 166A-3ECD Keep animals between stages 
(keeping fish on a non-water stage or others on a water stage will cause problems)
A081-1273 / A086-13E3 High jump for Donkey Kong
2D81-1273 / 2D86-13E3 Super jump for Donkey Kong
3D81-1273 / 3D86-13E3 Mega-jump for Donkey Kong
8081-1E73 / 808B-1AE3 High jump for Diddy Kong
AD81-1E73 / AD8B-1AE3 Super jump for Diddy Kong
2D81-1E73 / 2D8B-1AE3 Mega-jump for Diddy Kong
A08F-C273 / A087-C3E3 High jump for all animals
2D8F-C273 / 2D87-C3E3 Super jump for all animals
3D8F-C273 / 3087-C3E3 Mega-jump for all animals
D76B-337E / D76C-327E Get both Kongs back on the map screen after dying 
(doesn't work when you fall off screen)
DD8B-C28A / DD88-CE5A In the 2-player team mode, the inactive player can get 
control at any time by pressing A or Select on their controller
DDB9-3DD4 / DDB0-34A4 Pressing Start and then Select will exit any level, 
not just completed levels