The problem with alarm clocks, as night owls will tell you, is that they can too easily be turned off or snooze-buttoned into ineffectiveness.

Not so with the Tetris alarm clock: The only way to get this baby to stop sounding is for the owner to prove they're awake and alert by completing four lines of Tetris. If a sleepyhead hasn't begun the game within 30 seconds of attempting to silence the alarm, the grating sound will return in full force.

The clock, created by a member of DIY forum Instructables, isn't for sale, but you can learn how to make it yourself on the site.

[via Geekosystem]