DIY Open Source GameBoy

Matt over at Liquidware Antipasto is making an Open Source GameBoy out of an Arduino:

Ok, so ever since middle school I've wanted to make one of these... but I only now have enough know-how and support to make it, ... an Open Source game boy :) Actually, it's a little smaller than a game boy, but it's 1000% cooler (in my opinion) because it uses an Arduino as the "core", and a few modules and shields that already exist.

But does it Tetris?

Using the InputShield to make an open source Gameboy [Liquidware Antipasto]