Infinite money
At the title screen, press L1+L2+R1+R2, then press Square, Triangle, Start. You will enter the map selection screen. Hold L1+L2+R1+R2 and press Circle. If you press correctly, you'll hear a sound.
To increase money in the game, press Start to pause the game, then press Left, Right, Up or Down to incease the amount of money.
