The games are split across multiple pages. You can scroll up and down on a single page, but there's a link near the bottom right area to take you to the next page of games.
It is a bit odd. Typically if you have a scrolling list of something, you expect that all the items are going to be in that list. Either that, or put only 2 or 3 games per page and have no scroll bar. They've mixed navigation methods.