Credits: ITz_DaKs
Start by crafting new blocks, one for each floor you intend to build. Place a block on each floor, but make sure they are all lined up. Now when you are going jump standing on the block, it will move you one floor higher. To descend, you will need to jump while also crouching.
Make sure to enable Experimental gameplay features in the world's Settings.
Edited: 12.10.24