Intruder

Intruder is a multiplayer take on the kind of stealth gameplay that single-player series like Metal Gear Solid, Splinter Cell, SWAT 3 and Deus Ex pioneered. Two small teams face off in fully interactive buildings — one side trying to extract objectives without being detected, the other side trying to spot and stop them. The maps are built like real facilities: working security cameras feed live footage to monitors, spotlights sweep on schedules, ventilation shafts let you crawl between floors, sliding windows open and close, elevators run between levels.

The tools available to both sides are what give the game its texture. Guards can wire motion detectors to explosive traps, watch the camera feed from the security room, and call out intruder positions over the hand radio. Intruders can use real SWAT-style hand signals for silent communication, ragdoll their bodies to play dead while a guard walks past, and eavesdrop on the opposing team through proximity voice chat — which works in reverse too, so any whisper you make can give you away if you're close to the enemy.

Firearm handling is built on a simulation layer rather than arcade rules: bullets drop, wind shifts shots, and climbing, crouching, crawling and swimming all factor into how you move through the building. A Unity 3D level-editor plugin lets the community build maps and game modes of their own, and the developers ship regular updates driven by player feedback. The atmosphere of any given round depends entirely on how well your team coordinates — silent and surgical, or loud and improvised when something goes wrong.