William and Sly 2 is a gorgeous, ethereal fantasy exploration game wherein you play a nimble fox tasked with finding the scattered pages of your human friend's journal, while gathering mushrooms, finding keys to unlock mystery boxes, and freeing rune-bound spirits and pixies trapped in frost along the way. [more inside]
This should get your goat: Insanely hard sliding block puzzles. (Can't take the heat? Maybe you'd like to try an insanely hard sliding door maze instead?)
Just My Type. Sharpen your eye for letterforms by matching each close-up snapshot with the letter it came from, or test your eye for color with Color Me RGB, a couple of the interesting braincandy games from Scott Kim. (Also see his gallery of Inversions; I love "Figure", and the clickable tessellating alphabet.)
All your sperm are belong to us : play the condom game.
Collage Machine from the National Gallery of Art. Click images to add; drag into place; click the green tab to bring an element forward, click red to send it backward; use the controls at the bottom to resize, flip, rotate and fade elements; see if you can ever, ever stop.