Finally, you can also face mechs and androids. These dangerous enemies are capable of firing heavy lasers and missiles, so forget the way you used to kill other guards because you will have no chance of success with them. Instead, try to adopt a more strategic approach and see if there are no exploding devices that could cause severe damages to the droids before starting the combat directly. Among the important items you can find are the med kits to heal your injuries, the power cells to regenerate your energy and the ammunition which needless to say is essential for your survival. To completely restore your initial health and energy, you must locate health and charge stations in which you must enter for a short moment to complete the process.
Crusader also contains puzzles which undoubtly adds an additional interest to the game.
Puzzles consist of switches that control lasers, platforms, bridges, electric fields, etc. Some of the switches can be located easily, but others will require you to look for them behind piles of containers for example. Some of the doors are also equipped with card readers. The fact that you hold the same color key card as the card readers doesn't necessarily mean you have the correct one to unlock a door and this is where the difficulty arises. You must possess the right key to open it.