Quake III Arena/Tier 2: Skill

Q3DM4: The Place of Many Deaths
Enemies: Orbb, Bitterman, Grunt

The rocket launcher is on the upper floor, with the quad damge just below it's bridge.

Q3DM5: The Forgotten Place
Enemies: Hossman, Daemia

Red armor is at the end of the bridge. The bridge has two access points, one in the middle and one on the far side of the map.

Rocket launcher is under the bridge. It is available either from the Red armor section, or by dropping down a crack in the bridge.

Q3DM6: The Camping Grounds
Enemies: Orbb, Hossman, Daemia, Bitterman, Grunt

The quad damage is in the central chamber.

A reference to find the railgun is to take the doorway in the central chamber, that is opposite of the lift. Head up the stairs, and look on the left wall for a lift. This lift brings you on a circular path on top (which is somewhat exposed) but allows you to collect the one-hit weapon.

Q3TOURNEY2: The Proving Grounds
Enemy: Hunter

This is a one-on-one match against an opponent, in a circular arena. On the highest difficulty, she is deadly with the Lightning gun, which is located in front of the bridge side of the teleporter. If you camp that area, you are likely to severly injure her.

The rocket launcher and its ammo are found in the lower floor of the two-story room.

As the opponent is deadly with the lightning gun, your best option is to use sniping tactics with the rocket launcher. You can perform an initial snipe from the bridge, but afterwards, keep watch at one of the corners of the map. When you see activity, launch a rocket and be prepared to fallback as the enemy approaches.