One Second Perception Ability Game

One Second Perception Ability Game is a free browser game with one simple rule: click once per second, ten times in a row. It automatically works out the average deviation of your intervals, so you can see how accurate your sense of rhythm really is. It's built for fun and friendly competition—and for sharpening your feel for how long a second is. Note that it's not a formal training tool, and the timing may vary depending on your device.