Trip in the Head
Tracer showed Thunderbird and me round his new map-in-progress, back when it was a beta, beginning by warning us that, while it looked rather like Gladiator Dome, it played rather differently... and he was right.
The room you initially spawn in contains a massive four-sided staircase, which cuts off two sections of the floor - go to one for a shield and health recharges, and the other for a triple strike and ammo. It is just possible to leap out of these corners, as the gravity is low - I would prefer it a little lower still, to make that easier! Exit down a short corridor, lined with what looks like a second type of carpet on the walls, and you come out in the massive place where I took the screenshots.
The very bottom of the "head" has a megapower; not far away is a fairly deep pit, with a whomper and plenty of ammo... and no way to get out again! Though I kindly shot down at him until Thunderbird respawned elsewhere, to save him having to lose points by "suiciding"... What is on the very top platform of all I was by no means sure, back when we did the play-testing, as I never got anywhere near it (though sometimes one respawned on a platform about halfway up), but I suspected whompers - and the new screenshot, taken as usual nowadays with the help of the "fly" cheat, confirms that!
Well, I normally hate platform-jumping arenas, but at least one doesn't fall to one's death here, due to the reduced gravity, and there is plenty more gameplay. Tracer had added a cluster of columns on the floor of the room, since the earlist version he'd shown me, to make sniping more complicated - and may well have had other bright ideas along the way. See that "canopy" at the bottom of the "beta" screensot (below), towards the right, with a doubler on top? There is also a hidden cache of ammo of all sorts, if you walk through the right bit of wall! At that stage, it was a very enjoyable place to play in... Tracer certainly took his time in releasing the finished version, but it's out now, so it's your turn to do some exploring...