Hint: Extra Credits/Coins
When starting the game it is best to save all your money for the invincibility cheat, however reaching 1,000,000 coins is difficult. I found that the fastest way to collect coins is in level 5 of episode III, "Darth Vader". At the very beginning of this level, you have to run down a corridor while the floor crumbles under you. If you happen to fall in the lava you simply start at the beginning of the hall again. The cool thing is that you do not lose your coins. You can run down this hall over and over again, getting around 4,000 coins each time and then just dying at the end of the hall. It took me about 30 min. to reach 250,000 coins.