You have to use the arrow keys or the WASD keys to move the Doctor through the chambers, use the mouse to move the torch. You need to scan the boxes to find usefull kits. To scan the boxes you have to get within a close range of them. Watch out for your torch, it will run out. If you see a Weeping Angel keep it in the light, otherwise it will attack and you will be teleported back into safety by the clerics. To get bonus points you need to collect time crystals.