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GTA: Operation Sigma
GTA: Operation SigmaSurvival
GTA: Operation Sigma cover art
GTA: Operation Sigma is a free survival game by Ryomen. Play it online on Playgama.
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GTA: Operation Sigma
GTA: Operation SigmaSurvival
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GTA: Operation Sigma

4.3 / 128 votesM
Developer: Ryomen
Game Orientation: Landscape
Platforms: PC
Release date: March 2025
Last Update: August 2026
Game Engine: Unity
Supported Languages: English

About GTA: Operation Sigma

GTA: Operation Sigma puts you in control of a fearless hitman named The Hammer, tasked with ridding the city of Los Santos of bad guys across 30 missions. The action unfolds from a third-person perspective, with the number of targets to eliminate displayed on the left side of the interface and on the minimap. The main goal is to collect as much money as possible and become the most powerful person in Los Santos.

Tall rectangular buildings with rows of square windows line the open street areas visible across several scenes in the game.

How to Play GTA: Operation Sigma

Each mission tasks The Hammer with destroying or killing the targets shown on the minimap. Shooting crates can reveal hidden goodies worth grabbing. The Hammer can pick up different weapons and grenades, enter vehicles including cars and tanks, and man turrets that offer considerably more firepower. His special ability, Hammer Time, slows down time and lets him collect special gadgets that help him or improve his weapons.

Difficulty Levels

    • Easy: Normal amount of money earned; normal damage taken.
    • Medium: Damage taken increases by x5; money earned increases by x3.
    • Hard: Damage increases by x10; money increases by x10.
    • Impossible: Damage increases by x30; money increases by x20.

Controls

    • Mouse: Aim
    • Arrow Keys / WASD: Move
    • Space / J: Jump
    • Left Mouse Button / Z: Fire
    • Right Mouse Button / X: Throw grenade
    • Left Shift / C: Activate Hammer Time
    • Mouse Wheel / Q / E: Cycle weapons
    • E / Enter: Enter vehicle
    • Esc / P: Pause game
    • M: Mute audio toggle

Games You Might Like

Fans of open-world action and survival will find plenty to enjoy in survival games, where staying alive under pressure is always the central challenge. If battling through a city overrun by enemies appeals to you, Rise of the Dead delivers wave-based zombie combat with weapon upgrades and multiple mission types. For high-speed chaos with an arsenal of guns, Road Chase: Shooter Realistic Guns lets you unleash weapons ranging from AK47s to flamethrowers to stop a relentless pursuit. Those who enjoy the escalating pressure of Operation Sigma's harder difficulty settings should check out Mobhold, a fast-paced survival game where enemy waves multiply and difficulty scales with every run.

Browse the full action games catalog for more combat-driven titles, or explore the 3D games collection for third-person and open-world experiences similar to Los Santos.

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