Kyri writes –
I first made this game when I was around 11 or 12, when I was on some rant about how the original Operation dude didn’t wear any underpants. I told my mom she shouldn’t let my younger brother play the game because it was inappropriate (I didn’t actually believe this, though, I just liked arguing about things back then). So…I made my own (with boxers drawn on) and called it “Disease Remover”. it’s a very simple game to make, and it would make a really funny gift or practice for people who want to learn more about electronics.
instructables : Your own Operation Board Game – Link.