: A unique downloadable in-game weapon for Isaac Clarke.

: A high-definition port of the formerly Wii-exclusive prequel. It features PlayStation Move support for motion-controlled shooting and a local co-op mode.

: A redeemable code for exclusive in-game armor and weaponry that provides unique gameplay benefits.

If you are looking for the version with physical collectibles, you likely mean the , which includes:

The was a special retail version primarily released for the PlayStation 3, though it is often confused with the more comprehensive Collector's Edition available across multiple platforms. PlayStation 3 Limited Edition Contents

The PS3 version was highly sought after because it included a full additional game on the same disc:

: Includes basic instructions and illustrations for navigating the sequel. Dead Space 2 Collector's Edition (The "Premium" Pack)