This is nether rush, a challange map.
You spawn on the overworld, and see a nether portal. THen you enter it, and go in the nether, on top of the bunker, go in the bunker, get the starting kit, and read the rules.
Max 6 players allowed to play this gamemode, you follow the signs that lead you to another portal to the overworld.
Find treasure in hidden chests and follow rules. Remember, use your brain.

WHen u fall down in holes or go in hidden rooms and cant go up just climb back up whith blocks.

Additional Notes

Nether rush