Not the worst
knock-off we've ever seen, the tiny keychain toy pictured is called Revolve Games. This unit holds a total of 26 different games, each with 99 levels, although almost half are just variants on the Tetris clone Block Game. The small unit also contains games called Pinball and Tank Fighting
Even with all of the included features, such as top-screen mirror (yup, no gameplay presented there) and watch battery power supply, we wouldn't pay the supposed $6.20 USD cost for the little thing. How about you?