Hey all,
Used to play this relentlessly when I was a kid. I think it is pretty educational in the way it establishes logical flows and how things work. I've got my little brother hooked on it. We play it together and I'll ask him why he thinks certain things should be placed.
Check it out! The dos version is free. Just intall Dosbox emulator and find the program.
https://en.wikipedia.org/wiki/The_Incredible_Machine_(series)
You can even play it online it seems! Although it runs way better in dosbox.
Download The Incredible Machine - My Abandonware