Dolphin Olympics is a game where you control a dolphin and try to get as many point as possible in two minutes by doing jumps and flips. You use the arrow keys to control the dolphin, and it's all pretty straighforward. Making a new jump immediately after another is good, because then you get more combo points.

Also, landing nose first not only gives you a "nice entry" bonus, it also lets you build up more and more momentum to make higher jumps (and more combos). I've played it three times now, and the highest score I had was 88967. I wish there was a practice mode, with unlimited time.

Edit: Even newer high score: 215623