The Coliseum was a monument that was removed on April 3, 2017. It was replaced with the Maze. In order to enter the Coliseum, you would have to crouch or prone, then crawl inside a small hole. The Coliseum had a set of spiral stairs which upon climbing, you will be met with a floor that has a small table in the middle of it. On that table, you would find the Military Sniper. When you climb down the stairs afterwards, you will be met with Tiny Zombies. You will be forced to fight them, as you will not be able to crawl into the hole in time.