I found this in a short YouTube (death scenes list) video, but I can't find the video again, and I didn't really get a grasp of what it was about. From the looks of it, it's kind of like a survival game where people are having to get through a dungeon or underground facility, that happens to be full of traps. It almost looks like this place is actively trying to kill them as later on a cute thing flows down a stream, causing one of the characters to jump in after it only to fall down a waterfall, almost like it was meant for her.
There are also traps like falling floors, (I think there was a hall full of lasers as well), and I believe even axes coming out of walls. It also looked like a competition, might have even had teams, as some characters seemed determined to kill one another. Sorry for the horrible description, but I'm hoping this should be enough. It looked really interesting and am hoping to watch it, I just can't figure out what it was called.
I tried looking up things like "Anime with death dungeons", or "Anime like the hunger games" but to no avail.