There's a fair few "reaction tests" across the internet, and most of them follow one cliche idea or another - click at the right time, click the right amount of times and so on. This one is slightly different, and requires a bit more thinking than the standard methods.

There are two things to focus on, each of them a ring with 15 circles. You can rotate the outer ring with your mouse. When the colors of each of the circles match up, click the left mouse. If you've aligned them properly, you'll get points and extra time. Otherwise, you'll just lose some points. Then, the colors reset and you try again. Try to get the most rings possible in a minute and earn yourself a highscore!

There are 3 gamemodes, and 8 "skins".

Also, the song featured is named Obscurity, written by Dark Nebula.