When you can write nearly perfect versions of PacMan and Space Invaders in your favorite productivity application, you know it's crossed the boundary. Of course, treating cells like pixels and implementing the game by changing the background colors probably wasn't what the Excel developers had in mind, but frankly, that's not much different than what the guys writing the original games had to deal with. Wow. [SellsBrothers]

This proves my point that 80% of the world's business logic runs in Excel.  Perhaps most of the Video Games also do...and we just never noticed?  Splinter ExCell anyone?