Extra $50,000 (You can enter this as many times as you want) - SQUARE, CIRCLE, TRIANGLE, SQUARE, CIRCLE, TRIANGLE, CROSS (X).
These cheats also work on the first Thrillville game.
All Party Play mini-games
Press Square, Circle, Triangle, Square, Circle, Triangle, Right during game play while in a park.
Easy friendship
Get a VIP pass from some of the missions, first. Then talk to the person you want to give it to and select gift. This should take you to max friendship. Note: this helped me get a girlfriend faster.
Easy Thrill Points
You can get Thrill Points for doing almost anything, such as running a mile, riding a coaster, painting a stall, etc. If you get enough thrill points, you will advance to the next managerial level. A good way to earn Thrill Points is to pick up shiny signs that can be from shrapnel to an anti-Thrillville ad.
Everyone on coaster crashes at same time
Enter Crash and Bash as a name at the high score screen.
Everyone vomits
Enter Mortimer as a name at the high score screen.
Mission completion
Press Square, Circle, Triangle, Square, Circle, Triangle, Circle while in any park. Press Square at the mission selection screen to complete the highlighted mission and unlock the next mission. Note: Each time Square is pressed on a highlighted mission, the rank of the completion increases (from bronze, to silver, and finally gold). Note: To reverse your progression on a mission, press Circle at the mission selection screen to remove the highlighted mission medal.
Missions unlocked
Press Square, Circle, Triangle, Square, Circle, Triangle, Circle during game play while in a park.
Unlimited money and power
Enter Thrillville Thrillville Thrillville Rules Let's Go Go Go Go Get The Girls And Flirt Flirt Flirt as a name at the high score screen.