sonic

Sonic the Hedgehog Pocket Adventure
Goal: Beat Aquatic Relix Zone

Emulator and rom are bundled.
Start on hitting start, end on beating Knuckles and the game telling you that you beat Act 2.

Controls: A to jump, hold down and tap A to spindash

If you game over, you will be given the option to continue from the Act you died on.
Hitting giant rings at the end of levels takes you to a bonus you don't need to do.
This is the only sonic game I've ever kinda liked.