 If you liked
Btooom!
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 ...then you might like
Machine-Doll wa Kizutsukanai
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Both anime are crafted around a tournament/survival like setting. The characteristics that govern battles are also very similar in that characters fight with a variation of a type of weapon. In Btooom! these are bombs and in Machine-Doll wa Kizutsukanai, these are machines or automatons. Perhaps what is most similar between the two are the main characters. Both are very clever and strategic which make battles all the more enjoyable. The element of romance is also present in both.