Footstep sounds
Audio cues tied to movement that change based on surface material and speed, serving as both an immersive detail and a functional gameplay signal for stealth. Metal Gear Solid V's surface-dependent footstep noise (grass muffles, metal grates ring loudly) and Hitman's footstep audibility to nearby NPCs both make sound a mechanical resource in stealth play, not just ambiance. Designers use footstep audio to give stealth movement a genuine cost (running is faster but louder, crouching is slower but quieter), to create audio-based enemy detection distinct from vision cones, and to reward players who read the environment (walking on carpet versus tile) as part of route planning. Key decisions: how many surface types have distinct audio profiles, whether NPCs can pinpoint sound direction and distance realistically, how it interacts with other noise sources (gunfire, breaking objects) in the overall detection model, and clear feedback to the player about their own noise level. Pitfall: footstep noise with no player-facing feedback (a noise meter, a visual indicator) makes stealth failures feel arbitrary — the player needs to understand their own audibility to make informed movement decisions.
- Dev effort: Small
- Timing: Real-time
- Common in: stealth