How does arcade the work, I mean the part where bigger picture of the game shows up while other games below appear smaller for each of the categories, does it put to the top randomly or is it highest rated or most plays, I don't really know.
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The arcade homepage shows the top rated games in each category. The idea being the best games overall should float to the top and show here eventually.
All new games appear on the newest games list as they are approved.
Each category page default sorts by top rated, but there are lots of sorting options available (date, plays etc).