I'm fixing the Funhouse.

Maybe just make a one way door to a 1x1 room with a pressure plate on top of a TNT. Decoy house around it. Blocks made of obsidian.

Oh that won't work. A 1x2x2 corridor then.

Hohoho.

Here's one.

Make a small "hut", one-way door. They get in, step on a pressure plate, everything beneath explodes due to TNT, they fall into pit of lava.

I NEED TO TRY THIS OUT.

@NoJobNoRules: I just did two image dumps ; -; but ok