Interesting. At the talk page of the List of best-selling video games article in Wikipedia I pointed to an article talking about 70m units and wondering whether they all could be considered a single game. We had Block Breaker Deluxe and Sonic the Hedgehog at 8m, 100m looks awfully high in that list.

Possibly "the most successful mobile game of all time" is Nokia Snake. This has been preloaded on, quite literally, billions of phones since 1998.

@Bruce - Alas not very often anymore. You're far far more likely to find some stodgy 3d variation than the taut original.

Food for thought: We just learned yesterday that Pocket God was the first app to break 2 million sales. That means that, despite Tetris' extremely high sales over the last few months on that platform, less than a fiftieth of Tetris' sales are from the App Store.

Still fairly impressive if you consider the timeframe. I can't find in a quick search when exactly the iPhone version came out, though.

Tetris (and snake) are both awesome little games. However neither of them play well on a touch screen. Both games are so D-pad dependent that they do not translate well.

It is a testament to good deisgn that such a simple game can still attract new gamers. No wonder it is a real classic.