When you reach Sanctuary Hole after Chapter 9 (northeast area of the map in Three Horns Divide) search for a cliff and drop down to reach the entrance of the Caustic Caverns. Then go to the 'Guardian Ruins' at the northwest corner of the map and look for the mine carts on the train tracks. When you have found them turn right just before you reach the large door at the end of the tracks and go straight and jump over the two cube blocks. Then turn left to enter a cave with a some Minecraft blocks which you smash to enter a secret Minecraft area where you will find Creepers and blocks of gold, diamond, irridium etc. Defeat the enemies there to get special minecraft head and skins for your character. If you do not get the desired head and skin for a character or are not happy with the loot you got you can always choose to 'Save and Quit', and then continue your game to get different loot in this area.
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