drive in the front dooe on the bowser bike

Knock on the door and say: ''Please Sir/Ma'am, may i come in?'

Crash through the gamestop window while riding the rhino from donkey kong.

Knock down the entire front of the building with a car and say "Hey! I'm in Gamestop! :D"

muster forth a massive army and lay seige to the store. once inside blow the roof and raise your flag of victory!!!

go in through the back door

kamikaze in

~rctcrazy~

simply camoflage yourself as a guy who works there and go in through the "EMPLOYEES ONLY" door.

Ok this one is difficult here I go:

First you have a cow and you paint her like if it was a Volkswagen Sedan, then you go with her on an helicopter and throw her, then when it reaches gamestop it will explode (because obviously the cows explote) and then you jump, land on a tree, you cut it and make a snowboard table and ride to the gamestop.

There it was.

You ask for the keys =]