The trap is activated as soon as someone removes a block (here diamond).
The picture shows a cross section so you can see the inner workings. Normally, the floor around the diamond block is naturally flat.
The trap is based on the fact that you can set levers on block bottoms.
Block Removal Trap
that means when you dismantle the lever falls on the pressure plate, activates it and tnt and then you are dead, right?
Correct
but it would be pretty conspicuous if there was just a diamond block standing around!
da!lever can only be taken down from 1.8!
No, you can do that since 1.3. You can only hang buttons on the ceiling since 1.8.
oh
take the iron / gold pressure plate 😉
Shit