Gameplay in Sniper is split up into two sections for the two different mission packs; Montenegro, which is the main set of the game, containing all the targets, missions, rifles and upgrades, and Death Valley, which is an unlockable, expanded three-stage mission set in which you must protect an anonymous figure named Ben from hordes of infinite zombies.

Montenegro:

Montenegro is a one-level pack that contains various challenges (which are deemed "missions") about assassinating various NPCs on the level, whether this pertains to killing characters with accident kills or straight up killing one of the targets for a score.

Death Valley:

Death Valley is an expansion pack that contains a three-level system and various upgrades, and introduces tokens from the basic money Montenegro uses.

In Death Valley, the player protects an anonymous man named Ben, who is trying to repair his car but is being harassed by hordes of zombies. The player's job (on Normal and Hard difficulties) is to protect Ben at all costs until he can get his car up and running, while Expert difficulty has the player defending Ben against infinite hordes, never to fix his car.

Ben's car can appear in three different places in the Death Valley missions. One spot is down near the south, one near the north, and one near the northeast. These spots are changed depending on the difficulty, Normal being in the south, Hard being in the north, and Expert being in the northeast.

Death Valley also introduces the new token system, which came with a new upgrading system. When a player completes certain tasks in a mission, that unlocks the upgrade for purchase, which can be bought with tokens earned at the end of each Death Valley mission. The prices of these upgrades stack at around 2,500 to 3,000+