FIFTH CHALLENGE TOMB (Cliffside)
CHALLENGE TOMB ENTRANCE: The entrance to this Challenge Tomb is located in the central part of the Cliffside area of the Overworld. (screenshot) The tomb's location is marked with a star on the Overworld map. (screenshot)
SINGLE-PLAYER CHALLENGE: When you enter the room, a deadly ice vent blocks the walkway on the right, preventing you from moving all the way around the spike pit to claim the reward on the far left. Standing on the pressure pad near the entrance lowers the column on the platform in the middle of the spike pit. Depressing the pad also turns on the ice vents between you and the center platform. (screenshots)
Move off the pad to deactivate the vents so you can jump over the spikes onto the center platform. Place a remote bomb behind the column near its base. Then jump back across to the pressure pad. Stand on the pad to lower the column, raise the Staff of Osiris, and then detonate the remote bomb to fling the time bomb over the spikes toward you. Roll the time bomb onto the pressure pad so it deactivates the ice vent on the right side of the walkway. Keep the staff raised to prevent the time bomb from exploding until you have passed that vent. Then it's OK if the bomb explodes. Continue all the way around the perimeter of the room to reach the reward: the HEAVY GRENADE LAUNCHER and a MAX HEALTH UPGRADE. (screenshots)
When you enter the side room, various ice vents shut off, so you can exit safely. Either return around the edge of the room or jump over to the center platform then back to the ledge near the pressure pad. Leave the tomb the way you came in. (screenshots)
CO-OP CHALLENGE: The multi-player puzzle is a bit more complicated and is configured differently depending on how many players there are.
2-player puzzle: When you enter the room, a deadly ice vent blocks the walkway on the right, preventing you from moving all the way around the spike pit to claim the reward on the far left. Shoot the Eye of Horus switch on the left to turn this vent off. Plant a remote bomb near the switch. Then have Lara grapple the golden ring on the platform in the middle of the spike pit. Isis (or Horus) can then jump past the deactivated vents onto the cable and balance on it above the spikes. (screenshots)
Keeping the grapple extended the entire time, Lara should then walk around the perimeter of the room to the right, while Isis adjusts her position as needed in order to stay between the ice vents surrounding the pit. As Lara rounds the corner and approaches the ice vent on the far side of the room, detonate the remote bomb to flip the switch and deactivate the vent. Now Lara can keep going around to the left, while Isis continues to ride the cable. (screenshots)
Once Lara is standing between the center platform and the side room with the goodies, Isis can jump onto the platform and Lara can at last release the grapple. When Isis stands on the pressure pad near the grapple ring, the 2 sets of ice vents on left turn off so Lara can reach the goodies: the HEAVY GRENADE LAUNCHER and a MAX HEALTH UPGRADE. Now either return around the edge of the room or jump over to the center platform then back to the ledge near the switch. Leave the tomb the way you came in. (screenshots)
3- and 4-player puzzle: In this version there is a grapple ring near the entrance which is not necessary to solve the puzzle. There are also 2 pressure pads on the platform in the middle of the spike pit. The pad on the right deactivates the ice vent blocking the walkway on the right side of the room. The pad on the left deactivates the ice vent on the far side of the room. The ice vent on the left side of the walkway remains on, so you'll have to work around it. (screenshots)
Have one character jump across the spikes onto the platform with the pressure pads. (If you have a fourth character, he or she can do this as well, but it isn't necessary.) Then another character should stand near the golden ring and grapple the character standing on the pad. With the cable extending across the deactivated ice vents, the third character can then jump onto the grapple cable and balance on it above the spikes. (screenshots)
The character holding the grapple should now very carefully move around to the right, while the one in the middle (Isis) stands on the right pressure pad to deactivate the right vent, and the one standing on the cable adjusts her position in order to stay between the ice vents surrounding the pit. (screenshots)
As the character on the outside rounds the corner and approaches the ice vent on the far side of the room, the one in the middle should move off the right pad and onto the left pad to deactivate this vent. The character holding the grapple can then continue to the left, round the next corner, and then stop just before the ice vent on the left. From this position, the character on the cable should be able to jump over to the walkway on the left and claim the reward: the HEAVY GRENADE LAUNCHER and a MAX HEALTH UPGRADE. Now either return around the edge of the room or jump over to the center platform then back to the ledge near the switch. Leave the tomb the way you came in. (screenshots)
If you have completed all 5 Challenge Tombs, you will also receive a MAX AMMO UPGRADE as a reward and unlock the "I love tombs!" Xbox/Steam achievement.
NOTE: I have not played the 3-player version yet, but I am guessing it is the same as the 4-player. The character in the middle would then need to activate each pressure pad in turn, while the others stand on the grapple cable and move around the walkway. If you have additional info/screenshots, please .
†UPDATE HISTORY: 1/20/15 - First draft of walkthrough posted. 1/21/15 - Added note about rewards for solving all 5 Challenge Tombs.
ACKNOWLEDGEMENTS: Thanks to TheJollyMage for the 2-player screenshots. So far I've only played single- and 4-player versions.
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