 If you liked
Death Note
|
 ...then you might like
No Game No Life
|
Highly intelligent but maybe slightly irresponsible (understatement, both of those) main characters get into a position of power thanks to involvement of supernatural - a god of games/god of death getting involved in their lives. Both series have multi-layered mind games of protagonists againts difficult foes. While Death Note is very seriouis, No Game No Life is more comedical.