Spintronics Act One 교체용 퍼즐북

Bought this so my kid and I could each have our own copy instead of hovering over one book. The pages are sturdy enough to erase on without tearing, which matters when you're redoing a circuit for the third time.

Bought this so my kid and I could each have our own copy instead of crowding around one screen, and it's worked out great. The pages are thick enough that they don't bleed through when we're marking up circuits in pencil.

Second copy so I can work the puzzles at my own pace while my partner uses the original. The pages match up exactly, which makes comparing solutions easy. Only gripe is the binding feels a bit stiff, so it doesn't lie flat on the table.