Flashing Lights with Siren
The first thing you must do is select the Police Car or the School Bus. If you don't know how to, see one of the cheats below. Next you can pick any board to race on. You must get a "Hot Time" on that board. After you put your initials in on the "Hot Times" screen, you must go all the way to the bottom of the "Hot Times" list. Now hold left for about 35 seconds (you'll see the rollers moving to the left.) If you chose the police car or school bus, got a hot time and you're at the bottom of the list, then one of the designers heads will come rolling across the screen. He'll say, "I love this job."

Exit the "Hot Times" screen and choose another board to race on. Once you've begun the actual race, press Brake, Brake, Accelerate fairly quickly. If you did everything correctly, the lights on your police car will be flashing and your siren will be going off. Or the lights on the school bus will be going off. To stop the siren and/or lights, simply let go of the gas button.

Access the Three Other Levels
By doing this cheat, you'll have access to three of the levels that you race on when you "Cruise the USA," but don't normally have access to on the regular individual level select screen. This way you can race on the boards to try to beat your record times without having to cruise the whole USA first. The first thing you must do is go to the course select screen. Now hold down these button combinations:

Golden Gate Park - Left C, Bottom C and L (on top of the controller)
Indiana - Top C, Right C and L (on top of the controller)
San Francisco - Right C, Bottom C and L (on top of the controller)

The only course you obviously won't have access to now is Washington, DC. You'll have to "Cruise the USA" if you want to race on that board.

Choose the Hidden Cars
This cheat is actually slyly on the front side of the poster, but we figured we'd put it here anyway just in case you missed it. As with the arcade version of Cruis'n USA, you can select from a Jeep, Police Car and School Bus. The first thing you must do is go to the car selection screen. Now hold down Top C, Left C and Bottom C all at the same time.

If you hold down those buttons over the '63 Muscle Car (leftmost car), then you can choose the Jeep. If you hold down those buttons over the La Bomba (second from the left), then you can choose the School Bus. And if you hold them down over the Devastator VI (the gray car which is third from the left), then you can choose the Police Car. Holding those buttons down over the rightmost car will do nothing.

GameShark Codes

63 Muscle Car
8015056F 0005
 
La Bomba
80150573 0005
 
Devastator
VI 80150577 0005 

Italia P69
8015057B 0005

All-Terrain Vehicle
8015057F 0004 

School Bus
80150583 0004 

Police Car
80150587 0004

Thanks to Revolution reader Cowface, Sparki, K-man, and Joe!