There are 16 main levels, 2 hidden bonus levels, and a finale. Takes 3-6 hours to complete.
As you go on, the puzzles become more difficult and use different types of cubes that open doors, alter gravity, and move.
You can use vanilla-friendly resource packs on this map, since there was no resource pack created for this map.
I recommend using a shader for the nice skyboxes (I use BSL), but make sure you can see things under water and see portal particles. You can test this at the spawn area.
You get a torch that you can hold to light up dim areas with Optifine dynamic lights, but this isn't necessary if you don't use shaders and a high brightness setting.
This is a fan-map. Play the original here: https://store.steampowered.com/app/252550/Qbeh1_The_Atlas_Cube/