If you have a minigame, you could just use events on the spawn brick as:
Onplayertouch>player>addhealth -99
But if they kept standing on it then they'd die.
Edit: Maybe onPlayerTouch > Player > setHealth 1
but I tried making events on a spawn point and they didn't get them unless they moved back onto the spawn.
maybe bricks under the spawn point that they fall on.