There should be a trigger where it puts a cone like "field of view" on the front of the block. This could be used in live enemies, snipers, cameras, etc. Along with noise detection (it detects noises emitted from a block in a radius)This would put in use for a proper 'sneak' function in games. So with these it could make it feel like the enemies are more keened into their surroundings. Also you could ad light detection and light emitting. The light could be used in like flashlights, lamps, torches, etc. You could change blocks to emit lights in the behaviors (so you can toggle them) and you could change the strength of the lights, and the overall darkness of the level in the level settings.