Sighting and range considerations were added to the engine, allowing the player to only see objects within the line-of-sight, and at distances based on target size. The computer shares this limitation, allowing the player to hide behind objects to escape detection. In older "Apshai"-based games sighting was much simpler, simply showing everything within the current room. Another change is the use of energy to power most player devices, including weapons, shielding, and sensors. This limits the number of devices that can be turned on at once and requires recharge time after taking damage.