Read this if the game doesn't load.

Super Mario 63: A Flash Game

Move with Arrow Keys. Press Arrow Key twice to jump even higher

Action with Z, X, and C Keys

This SuperMario 63 Game will load when the coin count is 100. So you will have to wait. Along with moving, jumping, and collecting coins, you also need to look for Z sign and press Z to communicate.

Also play; Super Mario 64