Game Description:Another in the favorite Ape Escape franchise -- this time, instead of chasing the apes, you get to be one! Sarugetchu Saru Saru Daisakusen begins when the fiendish Specter captures Professor Hakase and shrinks his research lab down to tiny size. Kakeru and Natsumi, the regular heroes in the Ape Escape games, happen to be in the lab at the time, and they get shrunk as well.
It turns out that the professor has been planning for such an emergency. He comes up with a way to merge the research lab, which happens to look just like a hat, with the "piposaru" apes -- the same ones that usually cause trouble. It's up to the apes to collect Nano Cards in order to restore Kakeru and Natsumi back to normal size.