Super Paper Mario Cheats - Wii
If you go into 3-D mode while in the coffee shop in Flipside B1, you can access a gold pipe that will take you to an arcade where you can play three different arcade games using different functions of the Wii remote, winning prizes for top scores. A fourth game can be unlocked if you have a Gold Card.
Inifinite 3D with Mario
Beat Flopside Pit of 100 Trails twice and get Mario's Card. This will allow you to go in 3D for as long as you want.
Items and stages
Extra Mini Game in the Flipside's Basement - Get the Golden Card
Flipside's Pit of 100 trials - Beat Chapter 1 and unlock the outskirt in Flipside
Flopside's Pit of 100 trials - Beat Flipside's Pit of 100 trials
Easy Infinite Money
In order to do this you need at least 100 coins. Go to the Flipside Shop and buy 1 Gold Bar. Head to Yold Town in Chapter 1-2 and sell the bar for 120 coins. Go back to Flipside and buy another bar. Repeat until you can buy another Gold Bar, then keep buying and selling Gold Bars for quick and easy money.