This challenge is the most time consuming. You should probably wait to attempt it until the third phase of the battle, when the most enemies appear. It's basically impossible to do with scarabs and the weaker skeletons, since remote bombs kill them rather than knocking them back. Mummies, exploding mummies, and lizardmen can withstand some damage, so they're ideal targets.

Run/roll around the central pit, and when you see a cluster of enemies near the edge, drop a remote bomb just beyond them so the radius overlaps where they are standing. Then roll out of the way...

...and detonate the bomb. The blast will hopefully knock at least one of them into the hole.

If you're successful you'll see an on-screen update.

You'll probably take some damage while attempting this challenge. If necessary, retreat to a clear area and shoot a few enemies. At least one should drop a health pack. Take your time and stay safe. If you die and the game reloads, you'll need to start this challenge again. But there's no hurry; enemies will continue to respawn as long as you don't light the beacons.

Repeat the previous steps, moving around the central pit and planting remote bombs just beyond any enemies that happen to be standing near the edge of the pit. Get out of the way...

...and then detonate your bomb...

...to blast the enemies into the hole.

Once you've done this five times, you'll receive a MAX AMMO UPGRADE.

[Return to the Tomb of Set Walkthrough]