A boy who wants to play a new video game is then selected as a system user, 12 system users have to climb 50 levels up the tower of the gods. Only they can make it to the top they have to fight against one of them the winner becomes the admin.

but after he fought someone, everything changed. He would create another world brought to him by his opponent.

----- The first chapters are not very good but it gets better as you go along