If you’re not already aware that Angry Birds is the new Tetris, you will figure it out the first time you play it. It’s so unbelievably easy, yet it’s hard to get bored playing it … so much so you’re elbow, wrist and neck will start to cramp as you play on, telling yourself that you’ll get back to work or go to bed … just right after this next level.
It’s hard to pin down why it’s so addictive, but a lot of it has to do with simplicity. The rest is explained in this detailed piece on user-interface design. It’s a great piece explaining Angry Birds appeal for anyone interested in technology, but it’ll cut into game playing time.