The name is extremely 🔥

It is? I don't think I've ever seen such a mode in blooket

Edit: Reading through the unofficial blooket wiki (they don't seem to have a list on their site) the closest is battle royale but that doesn't have lockouts

In terms of the ping concern though responses should be received by the server within around 100 miliseconds top, so it would be basically unnoticeable

It is but instead of disabling it after a person has chosen, it just shows who answered the fastest after the round is over. I'm less worried about the delay of the server processing it and more about how long it'll take for it to get disabled for the other person once someone has picked. People are gonna be using their phones + school WiFi isn't known for low latency. Id guess by the time server has processed it and it's been sent to the opponent you'd be pushing human reaction time which is about ~250ms on average iirc. Personally I don't see why we need to do the whole disabling thing and if anything it probably would end up making the game feel unfair if people end up clicking but still losing cause it hadn't been disabled yet.

I agree with Brandon. WiFi, like most wireless standards is not only a latency (ping) nightmare - it's a jitter nightmare (𝚫ping), so it can't be calibrated. That said, we might be able to use precise timing on the client - unless, of course, someone underclocks their cpu in a way the system can't see (unlikely in year of our lord 2023, but who knows). Not sure about a few things though. First, how precise can we get already, then we need to know how if we need to and how to get more precise / closer to hardware.