كتاب ألغاز بديل لحزمة طاقة Spintronics

The puzzles in this replacement book are just as clever as the originals — my kids have been working through them nonstop and they fit perfectly with the power pack.

My son lost the original puzzle book within a week, so this replacement saved the whole kit. The pages are sturdy and the puzzles match the circuit pieces exactly, no printing issues at all. Back to building the radio project together.

Our dog chewed the corner off our first puzzle book, so this replacement saved us from buying the whole kit again. Pages are the same thick stock and the diagrams match the circuits exactly, no mismatched printing. Back to building that radio circuit tonight.