Coded Arms revolves around a military training simulator called AIDA, a virtual reality environment initially designed as a training program for soldiers to refine their skills. However, the system spiraled out of control, no longer functioning as a mere training program but transforming into a deadly maze filled with robotic soldiers and programmed entities.

In this mysterious world, advancements in medical and computing technology have led to a revolutionary shift, enabling direct connections between human minds and digital networks. This breakthrough has sparked an unprecedented rise in cyber hacking. Here, you are merely a daring hacker—not an elite soldier nor a mercenary, but someone seeking to breach the system and uncover classified data buried deep within. Whether driven by money, glory, or sheer curiosity, you soon realize that you are not alone in this digital battlefield.

Your journey begins with a simple weapon—a basic digital pistol. But with each battle, you acquire stronger weapons, from laser rifles and plasma launchers to energy blades that can slice enemies into fragments of floating code. Precision is everything: aim, shoot, evade, and exploit system vulnerabilities. The only path to survival and the greatest rewards lies in reaching the core database and eliminating the enemies and bosses guarding each sector’s final stage.

This is not just an ordinary shooter but a unique blend of action and strategy, where environments are randomly generated each time you play, ensuring that no two encounters are ever the same. Each level is a shifting maze of narrow corridors, open arenas, and hidden corners where enemies may be lurking, waiting to strike. Opponents range from robotic soldiers and security drones to colossal insect-like creatures and organisms with plant or insect characteristics.

The game begins in the Sector—a training level consisting of three stages—followed by Sector 01, which includes three battle zones: The City, The Base, and The Ruins, each containing six stages. Sector 02 introduces three additional battle zones, each spanning thirteen levels, culminating in a boss fight at the final stage. Sector 03, known as The Infinity, features a single battlefield with an endless number of levels where the difficulty continuously escalates as you progress. Throughout the game, players discover weapons and armor, with some weapons proving more effective against specific enemy types. For instance, high-energy electric weapons are particularly effective against robotic enemies, while light-based weapons inflict greater damage on insectoid creatures that thrive in darkness.

Beyond weapons, players can acquire upgrades that enhance endurance, increase reload speed, or even grant special abilities such as temporary invisibility or enemy disruption. However, the enemies are not mere stationary targets; they adapt to your tactics, learning from your playstyle and becoming more aggressive as you get closer to the hidden data within the system.

For those seeking an even greater challenge, the game features a multiplayer mode where players can engage in intense battles against each other. Modes include Deathmatch, where only the strongest survive, Keep the Mark, which requires players to maintain control over a designated point, and Last Man Standing, where the goal is to outlast all opponents.