After Chapter 9, Go to Sanctuary Hole and jump off a cliff then and go to Caustic Caverns run northwest till you reach the Gurdian Ruins and go to the Minecarts and turn right, jump over the rectagular rocks and turn left. and yyou will find Minecraft Dirt, break though those and you will find Minecraft stone, cobblestone and coal. Break though those an there will be Creepers and blocks of gold, diamond, irridium and other surprises. Once you kill the badass creeper (yes thats really his name) you will get minecraft skins such as Steve Head and Steaves Cloths.