Survival game anime... that's tough. Recently, there have been close to none, which is really sad because it's a genre I quite enjoy watching too. But here are my recommendations, in case anything interests you :]]
- Rokka no Yuusha: likely the only currently airing anime that can be considered a survival game. This is really hard to get into without spoilers, but I will just go ahead and say that the first 4 episodes or so will likely seem pretty generic for a fantasy/action show about ancient legends and whatnot. It really isn't what it seems like, this show is all about the mystery and the psychological conflicts the characters will have to face to eventually "succeed" (or not). Again, won't spoil anything just so it doesn't ruin the fun, but definitely give this a try. I wasn't even enjoying this that much up until episodes 5 and 6 (DAT NEW OP THO) kicked in and things started getting really good.
- Death Parade: if there's any other show that aired in 2015 and might be considered a survival game other than Rokka no Yuusha, this is it. Characters are put together in a scenario where they have to play in order to "survive" and, like most survival game shows, they experience extreme psychological pain. Some of the game scenes are so well done you will feel a lot for the characters. Seriously, this show managed to make me feel more for some of the side characters in less than 20 minutes than some shows have managed in over 20 episodes. The only problem is the ending. But we don't talk about the ending. Thankfully.
EDIT: just noticed this is on your mal lol. welp, now you do know it's a survival game anime, in case you didnt before :]
- Deadman Wonderland: talk about shitty endings and anime that make you scream "and what happened next?", if you want another show that'll make you feel so frustrated and just scream at you "now go read the manga, because fuck you LOL", dmw is the right show for you. Seriously though, if you enjoyed Btooom! and are into gory anime with twists (except said twists didn't even happen in the anime sigh), you will probably like this. Much like Btooom!, it is a survival game in which characters are given super powers and fight to... survive, y'know? In a prison btw. Also minus the romance and the protagonist isn't as interesting/different as Btooom!'s. Though, thankfully the female lead makes up for this. In any case, if you want to kill time with a decent survival show, you can give this a try. If you're looking for something really good or just can't be bothered to read the manga/get frustrated at shitty endings, don't.
- Tokyo Magnitude 8.0: I actually haven't watched this one, so this might seem like a blind recommendation, but I have heard great things about it. The show's name is literally the setting. And it's more about the survival part, rather than a game, but you know, same deal with the characters and having them join forces (or the opposite), sacrifices, etc.
- Texhnolyze: like above, it's not that much of a survival game, but mainly about the survival part. Also deals with mysterious societies, sci-fi and lots of mindfuck, like shows such as Psycho-Pass and Shinsekai yori which I LOVE A LOT are very well done for the most part :].
I realize the two latter ones might not fit the "survival game" theme as much, but I figured you might still like them. Would also include Fate/Zero here so that I don't get murdered by half of this anime community since I'm probably the only one who actually dislikes the fate series. Not stay/night however, it's really not worth your time. I could make a massive paragraph explaining why but this is a recommendations thread, not a casual discussion.
By the way, this is just an advice, but if you're going to watch Gakkougurashi!, please don't drop it by any means, even if it seems boring at first. The first two or even three episodes might seem a little average, but the way you should watch this show is by paying attention to the small clues that the show leaves (such as the creepy message on the board, the cross on the garden, etc) and eventually figure out what happened by yourself. Even if you don't want to, you will start wondering about everything, at some point, and thus you will enjoy it a lot. People say this show is all about the shock value like Madoka, but it's more similar to Higurashi if anything. There is shock value in the beginning, but what drives the plot and gets you really interested is the mystery, rather than the drama.
Finally, not a survival game anime, and this is just a 2 episodes long (48 mins each), but you should check out Denpa Teki na Kanojo. Overall, I found it to be pretty nice, really enjoyable to watch, especially on a storming night in your room alone with the lights out. If I could describe it in two words, that would be: stalking yanderes. Funfact: this anime's female lead is called Ame.
btw, I try to fit in as much anime as I can on these recommendations, so that the readers are bound to like at least one or two of them, don't mean to make anyone watch all of that lol unless they want to