You will need to have $100,000,000 in your pocket at once. This one will take a long, long time. So throw on a movie and watch as you play.
Money Grinding Method:
The easiest method (that I've found thus far) of accumulating money quickly is to set the game to Nightmare Mode and replay Episode 1. The Episode is 35-38 seconds long and will reward you with anywhere from $720,000-$729,000 money per play through on Nightmare Mode. REMEMBER TO UNEQUIP THE DARK BOOSTER AND ULTI-MONDO COSTUMES WHEN MONEY GRINDING.