My little brother recommended me the anime, 未来日記, Mirai Nikki, or Future Diary in English, so I went and checked it out. Turns out, it's a pretty interesting anime. I also watched Boku wa Tomodachi ga Sukunai, Koe de Oshigoto!, and decided to start catching up on Naruto again, from where I left off, similarly to how I did with One Piece, since I finished watching Slayers. Although I never did find the OVA episodes of Slayers yet...
If you've seen Law of Ueki, then there's a similar theme here. God is hosting a game where the last remaining participant in the game will become the new God of the world. Except unlike Law of Ueki, Mirai Nikki has a much more darker and twisted theme, as you actually have to kill the opponent rather than simply knocking them unconscious. And the anime makes good use of that fact to have a stronger, driving force for the characters, not only to become god, but also to survive.