@futurebird @trurl i had two of them, the 60-in-One and 100-in-One. there was a project book that came with each one which would give you numbered wiring sequences, a schematic, and a wiring diagram for each circuit in the book. the number on the kit refers to the number of projects in the book, many of which are basic knowledge for building larger circuits such as op-amps, flip-flops, sensors, signals, digital logic if the kit included an IC package, serial and parallel, etc, as well as fun stuff like a crystal radio.