Check it out:
Hold down all the buttons (square, circle, x, triangle, R1. R2, L1, L2, start, and select) and when the cheesy arcade game comes on, hold down down on the direction pad. This shoots out a homing laser that destroys all the ships with no effort, which will give all the normal cars. This also enables you to play in the strange toy car/off road vehicle mode. You'll understand when you see it. If you have a memory card, save it now so you don't have to do this every time you play. It will not save the off-road part, however.
Try this one:
Hold the brake and acceleration buttons at the same time, right after you press a button to start a time trial race. When you go around certain turns it will say "spinning point" on the bottom of the screen. Do a couple of 360's and get tons of points. It shows your total points during the victory lap. If you restart the race the code cancels unless you hold the buttons again.
Or this one...:
In case you didn't know this one that was brought over from the original, you can turn around at the beginning, right before you enter the main raceway, and run through the "wall". You will race the track with all the turns reversed.
Finish first in each track (novice, advanced, and expert), then return to race each track in Time Trial mode. After beating each track, the special car (Devil #13, Kid Car #13 or White Angel #0) for that track will be available.
Get a score of 0 in Galaga '88 by allowing all forty aliens to pass by. The phrase "Secret Bonus" will appear. Appearance options such as "Normal", "Noon", "Evening" and "Night" may now be selected from a "Scene" menu.
The game has twelve endings depending on which combination the tracks were raced. Racing in Advanced, Expert, Novice order has a different ending than racing in Novice, Expert, Advanced order.
Hold L1 + R1 and press the controller buttons to resize and move the spotlight on the title screen.
Thanks to Revolution readers Dondi R. Castro, Kiwi Breaker and Phil Black!