@Transistor Ah the light should stay until pressed again, for best results. To be honest now that I think of, it is not a huge restriction per se.. But push buttons and transistors sounds like something cheaper than Arduino, but also relatively simple so it is in the middle

@KenShirriff I don't know for the "game-show" part, it's for training purposes, but yes. The first player-specific-colored lamp to glow indicates the player was faster and the other circuit is then disabled until switched off in order for it to be detectable. I heard somewhere before that it is possible to achieve this via a trick with switches. It is possible that I missed a usage of something else, but it was super simple in overall

That looks promising! Something like that was in my mind too, unfortunately I cannot make a simulation in tinkerkad due to the lack of support for thyristors. There was a professional software that could do that and everything else, but I forgot its name

Did so! I hope it is clearer now. What is the RESET? Not sure it is symbolized like that in my country :D

@Jens I mean kind of. Just who player presses hits the button first. I just got an idea to maybe add two diodes if this cannot be done with only two switches (I can only test with SPDT switches) Now I can of course do all that with an Arduino, but I was considering that without it is also possible. And cheap.

You are right, technically the first schematic does (not (not conform)) to the requirement haha. I should've been more elaborate. I think the series circuit is the first thing I tried. I guess I am too tired to simulate it in my brain so I just do it in tinkercad

Switching any on must light up only one lamp and in that case it must be switched back off in order for the other switch/lamp to work. That can be used to easily measure speed.

Yes but, on the first circuit, doesn't the switch light up both lamps though? It almost works, but wouldn't the switch affect both lamps?