I'm working on a site and created a custom field called games and the archive page.
When one of the top categories, Android, iOS or PC are selected the left column shows the child categories, the middle column shows the latest six games to be published in the selected category.
Then when one of the Child categories such as 3D Action on the left within Android, iOS or PC is selected the middle and right columns display all the games that are published within that category.
I've attached a couple of images showing what I mean.
I can give you my FTP, Wordpress login.