[hawkjo]

I have to also mention nandgame.com here. Similar idea, but all presented as an interactive, browser-based game. Start with nand gates and build up to a functioning computer. You never get to tetris, but it's great and super easy to start playing/learning. Delightful.

[polycaster]

http://nandgame.com/ You‘re welcome.

[credit_guy]

Oh man, a big Thank You. I kind of know where I'll be spending 10-12 hours in the next few days.