Minecraft wiki entry for Creating_a_challenge_map, associated text: First, fill the first trapped chest with useful loot and then place a block underneath the chest and then TNT. Then place a second trapped chest 2 blocks away from the first chest and place a block then a dispenser with flint and steel and then minecart with TNT underneath. Then place a regular chest 2 blocks away from the chest. Then fill it with useful loot. Add signs next to the chests like: Armor/food/swords/reward inside!