I recently came across a browser based game called Little Alchemy. The object of the game is to combine elements to make things. You start out with just a few elements and can build up to stuff like islands, people, cars, and much more. There are 500+ elements/things to create/discover and so far I've found about 100. I like the game for its simple design and somewhat challenging, but fun, game play. All in all, it's a game that's easy to understand while also fairly relaxing and fun. There's not much more to say except go give it a try... you'll probably enjoy it as much as I do!