Serious Sam: The First Encounter/The Great Pyramid

Arena
The first part of the level takes place in an arena. Collect the starting items, and enter. The main battle starts once you go to the center of the arena. There's two health items and a ammo pack that will respawn throughout the battle.

There are four major phases to this arena battle:
 * 1) First, a kleer skeleton arrives from the side. This is followed by wave of kleer skeleton flanking from both sides, and then a continuous flow of kleers from the six upper openings. It finishes with a large waves of kleers alternating from the center of each side.
 * 2) A Sirian Werebull enters the arena, followed by two from a different direction. They will mostly attack in groups of up to 6. Finally, the werebulls will all arrive and run around in a circle, with some of them breaking their formation to attack.
 * 3) Biomechanoids will destroy the lower entrance, and enter the arena. Each tunnel is a source of one major biomechanoid and two minor biomechanoids, each having multiple waves.
 * 4) Finally, Kleer skeletons will apporach from all directions.

If for some reason you get knocked out of the arena, there are jump pads that you can use to jump back in. If you're knocked out towards the pyramid, then you have skipped this section but still need to make sure you approach the normal exit to avoid bringing the game to an unwinnable state. For those wanting to skip the section, it is possible to attempt a rocket jump over some of the walls to bypass the arena entirely.

In multiplayer, there's additional enemies that spawn. There are four Aludran Reptiloid that appear on the corners of the arena, and defeating them causes a Aludran Reptiloid Highlander to arrive.

Path to the Pyramid
Once Ugh-Zan III is awakened, you will have a limited time to reach the pyramid, as he will crush you if he gets too close. Once you reach the ramp, he won't be able to stomp you, plus the countdown to the pyramid door will start.

The first group of enemies starts with minor biomechanoids and sirian werebulls starting near the pyramid.

About half way to the pyramid, before the ammo pack, additional werebulls will charge from the pyramid.

About three quarters of the way will start with major biomechanoids from ahead. In multiplayer, there will also be lava golems.

When you reach the ramp, kleer skeletons will attack in groups of three until you reach the raised platform.

On the raised platform, Ugh-Zan III will draw two weapons and use ranged attacks that are easily dodged. You won't be able to take cover behind the columns, as they will self-destruct. The only enemies will be a few kamikazies at try running up the ramp. While waiting for the countdown to finish, you can hit Ugh-Zan III with cannonballs, to around half health. Once the countdown finishes, it will beep to let you know that you can enter.

Ugh-Zan III
After entering the pyramid, and watching the cutscene to activate the teleportation beam, you will be in the final boss arena. It's only you against Ugh-Zan III, and all of his attacks are dodged by simply sideways movement.

While in the arena, you can continue attacks until his health bar reaches 25%. Around that point, he will slowly regenerate, and if pressed further, he will heal himself greatly requiring you to repeat the attacks.

To defeat him, you will need to keep him near the center of the arena. While he is there, use the jump pads in the corner of the pyramid to fly into the rings. When all four are activated, the teleportation beam will activate after a short delay - if he's already reduced to his regeneration threshold, it will kill him, and the game is won.

Secrets
There are no secrets in the original version. However, the HD version includes three secrets:


 * 1) In the arena, in the middle tunnel on the right.  This contains armor, but will spawn eight minor bio-mechanoids.
 * 2) In the arena, in the middle tunnel on the left. Contains a large health. It is best collected after all enemies are defeated.
 * 3) On approach to the pyramid, head right towards the Aztec head. A super health is here, and picking it up spawns a large number of kamikazies.