Sonic Xtreme 2

You control Sonic, running automatically through a side-scrolling stage. Your main job is to collect rings while avoiding obstacles and enemies. You use the arrow keys to make him jump; timing is everything to clear gaps or bounce off springs. The screen keeps moving, so you have to react quickly. The challenge comes from the increasing speed and the layout of hazards. It feels like a quick test of reflexes, a straightforward rush from start to finish.