The elevator to the left (E1a) doesn't work yet. So go to the right, carefully avoiding the first of the 2 steam jets. When the second jet cycles off, grab the crate and pull it to the right once. Then wait until the steam jet on the left is just about to cycle on before starting to pull the crate again. By the time Lara reaches the steam jet, it'll be off again. Pull the crate all the way out of the hallway. Position it in front of the elevator so you can drop onto it from above later.
Return to the right past the steam jets, climb over the low ledge and use the computer (C1) to start a platform moving above. Climb onto the low ledge, jump to grab the ledge on the left, pull up and shoot the security droid. Climb onto the wall, jump to the ledge on the right and move to the right edge. When the moving platform descends, jump onto it.
There are 2 more security droids above, one on either side. Draw guns and crouch to avoid the robots' laser fire as you destroy each one. Jump over to the ledge on the left. Walk to the left edge and when the smaller moving platform approaches, jump onto it. Ride it to the left and jump to the ledge. Use the computer (C2) to open a door (D2) below. Jump back to the moving platform, ride back to the right and jump off. Go to the right, jump onto the larger moving platform and ride down. Jump back to the ledge on the left. Then jump down to the wall below on the left.
Instead of climbing down, jump across the gap to the left to grab the edge of the electrified floor. Wait for it to cycle off, then pull up and move off to the left. Wait for the second section of electrified floor to cycle off, then run across it. Get the medikit and then use the computer (C3) to activate the elevator (E1a) below.
Carefully cross both electric floors. If you left the movable crate just below, you can drop off the end of the ledge onto it. Otherwise jump to the wall on the right and climb down the other side. Then return past the steam jets to the start.
Go to the elevator on the left (E1a) and ride down to the floor below (E1b). Wait for the steam jet ahead to cycle on and then step onto the conveyor belt. By the time Lara reaches the jet, it will be off. Jump past the second steam jet and onto the next conveyor belt, which is moving to the left. Run to the right to cross it. Wait for the next steam jet to turn off. Then move past it. Wait for the steam jet beyond the next conveyor to cycle on before stepping onto the belt. Move past the last 2 jets and ride the elevator (E2a) down to the floor below (E2b).
Drop down and use the medikit. Leave the movable crate alone for now. Climb down the ladder and shoot the Doberman. Go to the left, climb over the wall, drop down and shoot another dog.
Use the computer (C4) to lower a platform above temporarily. You need to get up to it before it rises again. To do this quickly, stand at the left side of the computer to use it, step to the right once then jump to the right. Jump straight up to grab the ledge above, pull up, turn left, jump to grab the next ledge and pull up. Cross the ledge and jump to grab the next ledge to the left. Turn right, jump to grab the next ledge, pull up, turn left then jump to grab the edge of the moving platform before it rises out of reach.
Ride the platform upward and jump onto the ledge to the right. Use the computer (C5) to deactivate the pressure pad (P6) in the room to the right. Jump back to the moving platform (now stationary). From there, jump to the ladder on the left wall and climb down to the floor.
Return to the bottom right corner of the map and climb the ladder to the room above. Push the movable crate on top of the pressure pad (P6). Before deactivating the pad, this would have raised a block (B6) above, preventing Lara from climbing over. Now she can climb over the wall to reach the exit.
NOTE ON ITEM & MAP CODES: Each level and item has a code, which can be found on the map screen or item info screen. Once you have a code, you can enter it on a page at the Tomb Raider Mobile or Eidos Mobile UK web site to access a level map or detailed item information. My walkthroughs include all of the item info, as well as my own maps, which are a bit more detailed than the unlockable ones.
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