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If you liked Btooom! add

...then you might like Danganronpa: Kibou no Gakuen to Zetsubou no Koukousei The Animation add

Both shows has unique similarities: weak main characters who eventually became badasses and out-of-this-world survival game mechanics where everyone has to kill in order for them to survive/escape their current situation. So if you like a gut-wrenching, adrenaline-flowing typed survival anime, then choose one of them.