I had the TipToi's precursor as a kid: https://www.erinnerstdudich.de/70er/elexikon-von-ravensburge... (scroll down to the comments for more pictures).

This used a much simpler device - basically it consisted of two electrical probes connected with a wire, one of them containing batteries and a light bulb, and it worked together with a board with contact pads with hidden interconnections. Then there were several sheets where you had to find the numbers in the picture corresponding to the labels printed along the right side of the sheet.

I also like the honesty of the text on the box saying that it's "electrical", when the temptation to (incorrectly) use "electronical" instead must have been great...