NeoPets

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http://www.neopets.com/

A large set of flash games and a system of 'things to buy with points' - as well as a CCG (by WizardsOfTheCoast) and assorted other merchandising.

But some of the flash games are actually fairly good. You can play a large number of them without a (free) account, even.

Very very fluffy and aimed at small children, mind you. Seemingly affiliated with PuzzlePirates.