The following review DOES NOT contain any spoilers.
Story: 9
Btooom! follows 22 year old protagonist, Ryōta Sakamoto. Ryōta is one of the world's best Btoom players, an online multiplayer where the objective is to seek out and destroy your opponents using BIMS (bombs). However, after being kidnapped and transported to a secluded island, he is forced to play the game for real.
The story entails a mix of survival and psychological. The story is literally booming with ideas. From the unique BIM variants, to the psychotic inhabitants trying to blow you apart at any opportunity.
Art: 8
In terms of art, Btooom! has a lot going for it. The scenery is superbly detailed, and the lighting is magnificent. My only negative comment so far is blood lacks detail.
Sound: 7
The voice acting is what you'd expect from the majority of anime. Unfortunately, the soundtrack isn't anything impressive.
Character: 9
The story has your typically pathetic protagonist that we all hate to relate to. Being a psychological drama, the show is full of gritty characters with rather interesting and unpredictable personalities.
Enjoyment: 10
It's rare to come across an anime with so much to offer it's audience. Explosive action, great characters, and a story that will actually keep you guessing.
Overall: 9
Fans of Mirai Nikki, Gantz and Deadman Wonderland will be in for a treat that will keep you on the edge of your seat from start to finish.