Cheat mode:
Enter these codes on the password screen. To access the Password screen, press R + Z on the title screen.

All tracks
Enter THEUNIVERSE.

All characters
Enter HAPPYHEADS.

Iggy's girlfriend and no other characters
Enter ENTAROADUN.

Turbo mode
Enter 2TIMES.

Ice platforms
Enter ICEPRINCESS.

Gooey platforms
Enter GOOEYGOOGOO.

Icy and gooey platforms
Enter GOOEYICEPRINCESS.

Level select
Enter JUMPAROUND. Then, pause game play to access the level selection option.

Mix and match mode
Enter SWOPSHOP.

Obnoxious Particle FX
Enter OHMY. Running into other balls or obstacles may cause bombs to appear randomly.

Full turbos
Enter GOBABY.

Fat reckin' balls
Enter TOOMUCHPIE.

really tiny balls
Enter MICROBALLS.

Non-stop roller ball
Enter NONSTOP.

Enable Turok 2 graphic effect engine
Enter 2ROKTOO.

Black and white mode
Enter ROLFHARRIS.

Bouncy reckin Balls
Enter TOOMUCHFUN

Full boost:
Tap Jump while on a boost platform.

Hear the Character's Voices
While at the player select screen go to a character, press left and/or right on the joystick and wait there for a minute (or so) and they will say what the say when they get hit.

More Characters
Get nine secret characters by beating each For example, if you beat Downtown you'll get Sno-eee. If you beat Candylane you'll get King Jr.

Bonus Character
Press Z,A,L,R at the player selection screen

Be Banjo and Kazooie
Press B,A,L,L,Z at the player selection screen. Banjo has a long grappling line and Kazooie can jump high.

Refil Boost Meter
Tap JUMP while on a boost platform to refil your boost meter.