./ linked to this article on the most addicting flash games available. I can’t vouch for any other then Desktop Tower Defense, which is the most instantly-addicting flash game that I’ve ever played. Like all good flash games, it only takes a few minutes understand the mechanics, but you’ll quickly be challenging yourself to beat your own score and those of others. I’d write more, but I’m still trying to get all the way through a medium-difficulty game without losing a life.
