Part 13

Part 13 Intro: Surface and proceed through a cave. After grabbing rockets and bullets, a Bio-Mechanoid appears. Use the Rocket Launcher to defeat it. The level ends in the next room.

Oasis - Level 5: Surface and gather items. Enemies will appear near a building; use rockets. When enemies, including Kamikazes, spawn behind you, switch to the Tommy Gun. After clearing the area, enter the building. Inside, grab items, then the grenade launcher. Use it in the left room. Switch to the double shotgun for Skeletons. In the right room, use the rocket launcher for an Arachnoid. Find a backpack in a large room. Frogs will spawn in large numbers; use the Tommy Gun, occasionally a rocket for packed groups. Proceed to the next room.

Enemy Waves: In the next room, enemies spawn in five layers from back to front. Eliminate them layer by layer. The final layer consists of frogs, use the Tommy Gun. Continue to the next area.

Dunes - Level 6: In this desert area, defeat initial enemies including Mechanoids, Bulls, Gnaars, and a large Mechanoid. Cross the hill. Grab items in the center. Use the Rocket Launcher for charging Bulls, and Tommy Gun or rockets for Skeletons. Use the Rocket Launcher to clear remaining enemies. Grab new items. Use the Tommy Gun for approaching Kamikazes, taking cover near the building if necessary. After the wave, grab the backpack. Use the Rocket Launcher for enemies near the building. Enter the building to get the Lasergun. Use it to defeat spawning enemies like Skeletons, Mechanoids (use their fire against other enemies), and Reptilioids. Prioritize enemies on high pedestals. Exit the level.

Suburbs - Level 7: In these slums, hug walls and circle around, killing scattered enemies and those on rooftops. Look for secrets by sticking to walls. The exit is forward. In the next larger courtyard, the exit is locked. Find two switches: one by turning left from the center and walking forward, the other by turning around from there (or right from the center) and walking forward. After pressing both, enter the sewer directly forward from the courtyard entrance, hugging the outside wall for secrets.

Sewers - Level 8: Dive down and go forward into a secret corridor. Resurface and kill enemies in the immediate area. A blitz of frogs will attack; step back and use the Tommygun. The door is locked. Jump onto the raised platform with a shield to the right. Dive into the water and press the button on the post farthest from the locked door. Resurface and enter the door. In the next room, deal with many frogs. After getting the armors in the area...