For the Spleef, you can make powered blocks, add touch trigger in ALL of them. Connect touch trigger to a NOT gate, then link NOT gate to the block under the Touch Trigger. (this may take A LOT of time.)
One of the minigames I made was Fortnite. And their was creatures in the water in the background and like ships flying, floating islands, among us characters, guns, knifes, and potions. I know quite a lot
I remember I saw this minigame map that was based if erniec3 and they used spleef but they took an solid 30 mins to click play then kept trina make an elevator then he was like go do an obby while I build fnaf 💀