Super Mario Sunshine 64
This online Mario game plays very much like others available on the web, However, in this game Mario has an extra piece of equipment called a FLUDD which enables him to fly. This only works for a limited period, though, before you need to refill it with water at a pool. Use your left and right arrow keys to move and the up key to jump. Collect the coins and avoid (or jump on) your enemies. Keep your eye on the power and water indicators at the top left of the screen. This free version only has two levels, but they should keep you amused for a while, at least, when there is no sunshine.