Hunter X-Treme 64

Level select
By: Kevin Mumm

Press L,R,A,X,B,Y,A+C at the title screen, and you'll hear a loud growl. You now have level select!

God Mode
By: Kevin Mumm

Press A on the level you want to choose. To get god mode press L, R, Z, Z, B, A, Z at the main menu.