
I like the focus on "seeing" is believing. Observers of science, rise up! John Locke's "Empiricism" is alive and well!

Bloxorz - Maddeningly addictive... The goal here is to roll a rectangular brick end over end, or sideways to dump it into a hole. Don't knock it, until you try it! Rolling bricks has never been so perplexing or satisfying.
N - You are a gold-diggin' Ninja (hence the "N" title). This game clearly has roots in the old "Jumpman" Commodore 64 titles and a healthy nod to "Loderunner". The game play is deep and complex. There are over 500 levels in the latest version.
Mini-Putt - A classic from the early part of this decade. I don't even like golf, and I like playing this game. When this came out, my friends Pete and Chris went to war with me over low scores. It devolved into a long string of emails with screen caps that were under dispute, and cries of "photoshop!".
flOw - A beautifully designed, elegant flash game created by Jenova Chen. Flow is part of Chen's thesis research at the University of Southern California's Interactive Media Division. As you eat other organisms you evolve and swim deeper into the murky depths. Brilliant.
Click Fest - If you like popping bubble wrap, then this is the game for you. It's simple, yet compelling - click all the buttons on the screen as fast as you can. Be sure to try Click Fest 1 through 4 for some variety.