But the single-player campaign is not even half of what Killzone 2 has to offer.
Once the ISA campaign is complete, you can jump right into the game's meaty class-based multiplayer mode. Starting off as an average soldier, earning points helps you level up through the rankings and unlocks other character classes such as Medic, Scout, Saboteur, and Tactician.
You can also mix and match attributes to liven things up. Besides levelling up, you are also rewarded with ribbons for performing various personal, team and mission objectives. Earning ribbons gives you additional perks in the form of extra ammunition, abilities, etc. It's extremely addictive and gives the game tremendous replay value.
Also see: Review: Need for Speed: Undercover