Fun first person survival game, runs natively well. Ammo is scarce(and is money). Gas mask mechanics, lots of realism options.

Pausable real time strategy game. Raid buildings and shoot everyone. Has guns, body armor, cool fluff like mozambique drills. Is moddable.

Tactical, competitive FPS. Moderate realism. Small variety of weapons. Great gameplay.

Extremely detailed, complex firearms handling with "spooky" theme. Mods for more guns exist, too. Has semi-random levels. Dying restarts game.

Moderately realistic, in-depth RTS featuring variety of units, down to individual models and revisions of vehicles and infantry. Has okay naval combat.