[markus_zhang]

You can check out Onur Mutlu's videos on YouTube. I'd say it is much more demanding than NAND2Tetris.

[__rito__]

There are some parts in nand2tetris that are not self-contained, in the sense that even if you study and master all the preceding content, it is not guaranteed that you can solve the assignment. That's why I don't like it that much.