The Cube is a parkour Function pack. You can put this in any world you choose! (that's what makes function packs so great!) There are a total of 10 Levels so far.
To set it up all you have to do is /function Create Arena, then place the command block you are given and put /function CubeCore in it. Then set the command block as repeat and always active. DO NOT DESTROY THE ARMOR STAND, everything to make this work uses the armor stand, so for your sake and the armor stands, don't destroy it. If you have any questions, the video below should answer them.
Select version for changelog:
fixed a bug where you could break out of the cube