The most recommended characters for this level are Oxley and Russian Officer, as they have skills needed to complete this level. You start at the entrance to the tomb. Use the Russian Officer to destroy a box to reveal a button. Ignore the button for now. Switch to Oxley, as he can help you beat a 4-button dash down a ladder for the Artifact. The strategy to win this race is this:
Step on the button below the moat.
Then quickly go up the ladder and jump to the left and step on the button there.
Then run across the planks to the right and step on the button that was under the box.
Lastly, run to the right and step on the button near the fallen rocks.
Once you win the race after stepping on all 4 buttons, the ladder will go down and you can get the Artifact and finish the level.
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4b-2t. Tomb Time
HOW TO UNLOCK: Complete all Kingdom of the Crystal Skull - Part 2 normal levels.