In Dungeon Runs once getting iron, redstone by using a water bucket and breaking it off the ground and getting redstone torches off walls. You can make activator rails, and then get tnt minecarts by making a minecart out of the iron you get given in chests and combining it with tnt. Then you can place the activator rail, get a redstone torch to power it and place a tnt minecart and you can destroy the surrounding blocks. Don't know if this is patched.