ECHO PARKOUR!
Echo Parkour is a parkour map (duh.) where you can only see part of the course at any given time. The course is pretty difficult, of the 6 playtesters only 1 completed it, and it took them almost 500 deaths. The course has 4 checkpoints along the way to make the experience less frustrating. To play you must download the resource pack here, because the main mechanic will not work without it.

The Mechanics

Block-Switching
When you start the course, you are given two items. One will let you see all of the blue blocks, and one will let you see all green blocks. You can still stand on the blocks when you are not holding the item for that color, you just can't see them. Note that block switching is the main mechanic in this map, and for it to work you HAVE TO HAVE THE RESOURCE PACK. I'll link it again here, in case you didn't get it up there. Make sure you have the resource pack.

Half-Heart Health
This one is simple, if you take any damage at all, you die. That's it.

The Secret Rooms. (Not technically a mechanic but whatever.)
There are 3 secret rooms hidden around the map. They don't reward you with anything useful, but if you want something to do after getting tired of parkour, try to find the rooms, none of them are particularly difficult to find. Just a little extra side-quest.

That's the map!
My first parkour map, constructive criticism welcome. I'm very new to commands and map-making in general, so forgive me for stupid mistakes and let me know if there are any bugs/glitches that should be patched and I'll go and fix them. Thanks for reading/playing!