If you’re a fan of Atari’s vintage arcade games and games for the Atari 2600 video game console – titles like Asteroids, Tempest, Missile Command and Centipede – make sure to stop by the App Store this weekend and download Atari’s Greatest Hits. It’s free to unlock all 99 games included in this collection through the end of the day today – September 1, 2012.

Atari’s Greatest Hits combine recreations of Atari’s stand-up, coin-op video games from the 1970s and 1980s along with recreations of cartridges originally developed to work on its legendary Atari 2600 home video game console.

Normally Atari’s Greatest Hits comes only with Missile Command unlocked; the rest of the games must be acquired using In-App Purchases in packs or by unlocking the entire collection for $9.99. But thanks to a deal with Appoday, the entire package is free until the end of the day.

If you find the on-screen controls frustrating, you can consider a couple of alternatives: the iCade, a popular mini arcade game cabinet for your iPad sold by ThinkGeek, or the officially-branded Atari Arcade – Duo Powered joystick interface made by Discovery Bay Games, which I’ve seen on the shelves of my local Apple Store.