Minecraft wiki entry for Achievement_guide, associated text: A simple way to achieve this achievement is to place 9 slime blocks in 3x3 block wide (5x5 are recommended), then use several stack of block such as dirt, cobblestone, planks, etc. to make tall pillar by jump-placing block till reach heigh limit than drop yourself to fall into slime block. If you built at the top of mountains biomes, you will reach height limit faster, but bounce height also decrease.