Fallout 2

To stock up on healing powder, have the shaman make it for you in the village of Arrayo. Note: It is easier to find the Broc Flowers at night because they stay orange even at that time. The Xander Root is not as plentiful, but is still fairly easy to find. It is a tiny stalk of weeds, usually found in a cleared path. Be careful when using Healing Powder during battle because you will lose your aim. Hitting your target will become more difficult.
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There is a mutant called Marcus that wearing black leather armor and has a big minigun. In order to have him join you, you must frame the two humans who want to get rid of the mutants. You also will have to fix their mine with an air-cleaning device.

You can find chips to get skill upgrades in the various cities. After finding some, go to San Francisco. There is a man standing near a building that you cannot enter. Talk to him. He is from the Brotherhood Of The Steel. Complete his mission by going to Navarro and getting the Vertibird plans. He will now let you inside the building. Once underground you can find nice armor and weapons. You can also find the A.C.E. computer. You can use them at A.C.E. to increase various skills.

• Use a Gauss pistol or rifle and target his weapon arm. After you cripple it, he will not be able to shoot you with his dual plasma gun. He will then melee you, can only do about 10 damage per hit. Hit him in the groin to bring him down so you can do more damage by hitting him in the eyes.
  

• Kill the President and take the presidential pass. Once you have done everything else and you are at the end Boss, talk the squad into joining your team. This may or may not work depending on how many people you already have and your charisma. Use the Sneak skill and hug the wall along the bottom of the screen and make your way left until you get to the computer. One of the options is to make the guns shoot at your enemies. Walk up to him and start to fight. Each drone gun will shoot at him, plus the squad you convinced.
  

• Note: This trick can only be done on games that have not been patched to v1.02 or higher. Gain a level and wait for the screen with the perks to appear. Highlight the perk and click "Done" on the perk screen. However, click "Cancel" on the main screen. Click back to the character screen and the perk screen will appear again. Repeat these step to gain unlimited levels and 99 skill points.
  

• Note: This trick can only be done on games that have not been patched to v1.02 or higher. Get a untagged skill up to around 125%- to 50%. Then, level up and get the Perk tag. Tag the skill that you increased and it should go up to 250%- to 00%. This is useful when using the pulse rifle and aiming at Horrigan's eyes.