Basically, in the room after Kraid, you can jump straight into a door on the right wall, which puts you behind the door to the room you just came from. From there, run all the way to the door, aim up-left, and shoot to open another door which leads you back out of Kraid's room. This could save a few seconds or so from jumping back into and going across Kraid's room.
how do you get the first energy tank?
ImLocke 3 years ago