Before I played it, Six was recommended by many, many people. It was nominated for Best Game in the XYZZY awards, it did very well in IFComp, reviewers said it was the best game ever. But I wasn't very interested.
Having tried it, I see now why all the hype was there. This is a very fun game. You have to play hide and seek tag/tip with your six friends in a park. The game uses children, but the writing isn't childish. Each friend presents a unique challenge in catching them. After winning the game, you can unlock additional material.
The game features a wide assortment of sounds, which were never necessary except for one part of the additional material. The graphics are also fun but unnecessary (the map can be helpful, but the layout of the park is not hard).
This game is not very difficult. I use hints/walkthroughs on just about every game I play, but I manage to work my way through this one relying on in-game nudges only. Great game.