Codes

--->1080 Snowboarding
Panda Man: During the character selection, highlight Rob Haywood then press C-right and A to go to the board selection screen.
Ice Man: Same as above but highlight Akari Hayami and press C-left and A.
Gold Man: Same as Panda Man but highlight Kensuke and press C-up and A.
Penguin Board: Preform all tricks in training.

--->Excitebike 64
Unlock the code screen at the main menu by holding L+C-right+C-down and pressing A.
Stunt bonus: SHOWOFF
Invisible riders: INVISRIDER
Big head: BLAHBLAH
Small head: PINHEAD
Unlock all stunts: TRICKSTER
Mirror mode: YADAYADA
Night mode: MIDNIGHT

Unlock old style Excitebike by completing the Tutorial.
Unlock Soccer by getting 1st in Silver round at Novice level.
Unlock Hill Climb by getting 1st in Gold round at Amateur level.
Unlock Excite 3D by placing 1st in Challenge round at Pro level.

--->Rush 2
3 keys on one track unlocks the Taxi for that track.
6 keys unlocks the Hot Rod.
9 keys unlocks the Formula car.
12 keys unlocks the Prototype car.
4 Mountain Dew cans unlocks the Dragster.
A 1st place finish in the career unlocks the Midway course and the Jet car.
Unlock the code screen at options by pressing L+R+all C-buttons+Z.
Unlock most of the codes by pressing all the buttons (except start or B) lots of times.