WACKY WHEELS 

Enhance your game by starting the game with the command 
WW followed by one or more of the following options. 

/TURBO - Turbo mode; press BREAK and FIRE to accelerate
/JUMP  - Jump
/HOG   - 99 hogs
/ICE   - 99 ice
/FIRE  - 99 fire balls
/NOW   - Skip intro
/KID   - Kid mode
/2     - Double speed
/3     - Triple speed

You can combine these parameters
For example, "WW FIRE /3" 

Dopefish Cameo 
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Dopefish is a creature taken from Commander Keen, and 
can be seen by starting any single player race. 
When everybody else moves, stand still. Hold down the 
break, and turn left all the way around until the 
Dopefish shows up.

Note: the lion that starts the race must remain on the 
screen the entire time; otherwise, the Dopefish won't 
appear. You can do this as many times as you like, so 
long as the lion doesn't leave the screen.