See these two circles? One isn't empty but one is. Which is it? You've been asked this question before but that doesn't mean you're all out of answers. After all, there are many more ways to contemplate the differences, sometimes obvious, other times subtle, between two seemingly like spheres. That's why there is More Which?, a pleasantly uncomplicated puzzle from Yoshio Ishii of Nekogames. It's just challenging enough, requiring occasional lateral leaps or outside knowledge, to provide a full feeling of satisfaction when you make it through 20 levels with a perfect score. It's nice to be appreciated and it feels to good to be told "Good." And all you need to do is take a brief breather to click and point out which is which.