Yes, I wrote a virtual NAND gate programming tool a while back (think 2d Minecraft "redstone" style programming) and it was immensely fun to program and playing

Yes, I wrote a virtual NAND gate programming tool a while back (think 2d Minecraft "redstone" style programming) and it was immensely fun to program and playing with it taught me a ton about the gap between simple logic and actual computing (which is a huge matter of scale).