On August 17, 2010 EA announced that there would be two special editions of the game.The Limited Edition of Crysis 2 is available at the same price as the regular game, but in limited quantities. It comes with bonus experience points to "immediately boost the player up to Rank 5, giving access to all the preset class loadouts", a digital camo weapon skin for the SCAR, the "Hologram Decoy" attachment for the SCAR, and unique in-game platinum dog tags. The Indian Version, on pre-order, also includes the Threat Detector Suit Module (Early Access), and, on buying from the EA store, a gold dog tag and desert camo for SCAR.
Use Hologram in Crysis 2 Step 1:
Firstly you need to select the weapon which you have equipped.
Use Hologram in Crysis 2 Step 2:
Then press the number key that corresponds to it's slot. For example, IIRC, it's "2"; It will cycle through firemodes.
Use Hologram in Crysis 2 Step 3:
Now you need to switch to the underbarrel slot on your weapon (Crosshair/weapon stance will switch to a grenade-launcher style option).
Use Hologram in Crysis 2 Step 4:
Then just "Fire" and a Hologram will be launched.
Using hologram will make a image in front of you, and that will make the game more interesting.