When you reach the bottom of the stairs, a Mark of Set appears and several minions of Sobek emerge. This is the first opportunity to work on the Challenge: Bomb 5 Crocodiles off Ledges to their Death.
NOTE: Before attempting this challenge, you may want to avoid equipping items that increase bomb damage, since this makes it easier to destroy enemies with bombs rather than launching them into the air.
Run down the stairs on the left, letting one of the enemies follow. Stand near the left edge of the floor, where there's a drop-off with no railing, and turn around to face the approaching enemy.
When he gets close, run/roll past him...
...and plant a remote bomb so the edge of the blast radius just touches him.
Detonate the bomb to (hopefully) blast him off the edge.
A message pops up on screen if you succeed. If it doesn't work the first time, just plant another bomb and try again. You can then use the same tactic with the remaining enemy (or enemies), but there will also be other opportunities later in the level.
If you don't care about the crocodile challenge, instead just let the enemies appear and destroy them for points. The Mark will close on its own once all the enemies have emerged.
Be sure to bomb the crocodiles' prone bodies so they don't reanimate.
To get the MAX AMMO UPGRADE in the area to the right, first jump across the gap onto the ledge with the flame vents.
In the single-player game, grapple the golden ring and move around the left side of the taller of the two squat columns, then between the two columns, and around the right side of the shorter column. The idea is to twine the cable around the columns so Lara can rappel down the wall to the pressure pad, which shuts off the flame vents on the ledge.
In 2-player co-op there are 2 pressure pads but only one column. Have one character grapple the other. Once the connection is made, one should stand on the pressure pad on the right, while the other moves around the left side of the column and rappels down to the pad mounted on the wall. Depressing both pads at the same time deactivates the flames.
In 4-player co-op, there are 2 pressure pads on the wall and no columns. Have each archaeologist grapple an Egyptian and lower them onto the pressure pads. When both pad are pressed, the flames go out.
NOTE: I haven't done the 3-player co-op yet, but I assume it's a hybrid of the 2- and 4-player puzzles.
Once the flames go out, you can jump across the gap on the left to retrieve the upgrade.
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