Is there more sp than the amount of sp that is given out for completing the game regularly? Are there items? Does it depend on what game it is?

If you are in the top 10 rank, you get 10K everyday when the cron resets. If there are more than 10 people with the same score (like for the pumpkin collection, or the pastry collection) the 10K rotates between users and you get a payout every few months.

Oh that's cool, thanks :)

No problem. And I forgot to mention, not all games count. The ones on this page, with the exception of Item Hunt and Subeku are the ones that get the payouts. ANd some of them either no longer work, or aren't the same anymore.