I'm not typically a fan of room escape games, considering them point-n-click's vapid cousin, but this here's a good 'un.
Bars of Black and White comes from Gregory Weir, the talented fellow behind Majesty of Colours, and it's less of a full fledged challenge than it is a really entertaining proof of concept. You start off, as is typical of these things, trapped in a room with no memory of how you got there, but soon you get your hands on a barcode scanner and you'll start scanning every barcode you can find.
There's really only a couple of puzzles and most of the game consists of some clever jokes about the conventions and limitations of the genre. There's also plenty of shout-outs to other games including the greatest room escape of all time, Silent Hill 4.
As you're probably expecting, it's a browser game, it's undemanding, and it's on Kongregate, among other places. Go have a play, you'll smile.