 If you liked
Gantz
|
 ...then you might like
Zodiac Game
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Both are mangas that deal with games that play with life and death. Both have characters who are killed then revived to fight in a "game" of life. Battles with monsters determine whether you will be able to live the next day or not. Though, GANTZ deals with a lot of sci-fi idealogies, including technology and 'aliens'.