Maybe an area where you are in a giant mobspawner room and there is at least 16 sand hidden in that room and you need to kill enough creepers to get enough gunpowder which you need to make 4 tnt, which will act as the thing you need to complete the monument by placing 4 tnt and blowing it up.
Yeah so pretty much a combo CTM and Mob Battle
I do not like using TNT as I would have to supply the flint and steel, I might do that with spiders and wool though
Well, you ignite tnt to unlock the door, That might be something like a break out
I still do not like tnt personally, I have another interesting idea though, you have to make your own yellow wool from the mobs I give you and a small grass patch
I still do not like tnt personally, I have another interesting idea though, you have to make your own yellow wool from the mobs I give you and a small grass patch
Well, you ignite tnt to unlock the door, That might be something like a break out
Well what ever suits your fancy,
I am wondering if I made it too hard