This is one of my all-time favorite games and is now on sale for the lowest price I've ever seen on the App Store. The Ultimate Edition is based on the original release of Deus Ex: Human Revolution, which came out in 2011. It includes the pre-order bonus mission pack, and The Missing Link DLC, which launches as a separate program. The Director's Cut version of this game, which is available exclusively on Steam, incorporates the Missing Link into the main campaign for a more "seamless" experience. However, the Ultimate Edition offers superior visuals and fewer bugs. Completely worth the $19.99 full asking price, the current sale is an absolute steal. If you own a Mac and like to game, you owe it to yourself to play Deus Ex: Human Revolution.