Buy anything
While playing the game, press R + Z to display a menu with ground and air units, regular and advanced buildings, upgrades and research.

Invincibility
Play through the game until getting to Episode 3 (Protoss) in Brood War. Successfully complete the last round on that episode to unlock the Special Cheat (Invincibility).

Give me cash/gas
Play through the game until getting to Episode 1 (Terran) X-07: Patriot's Blood in Brood War. Locate the second Terran computer beacon in the room with four civilians. Use the bottom door to exit. Move to the right until the fire bats are encounter. Go through that area and locate the Ursadon being held in a cell. Use a marine open the cell door and approach the Ursadon. Move all your units into the cell when it asks to be hugged and press B. This cheat will give you 1000 minerals and gas.

All upgrades
Play through the game until getting to Episode 1 (Terran) X-04: The Jacobs Installation. You will start in a room with a door. Go through it and up the hallway. There is a missile shooter in the wall at the end, a door that goes up, and a hallway that goes left and right. Go through the right side hallway (with the missile shooter). Just take Jim Raynor and do not attack the orange civilian (move Raynor with the "Move" button instead of B so he does not shoot him). Talk to him and he will tell you not to kill him and that he will give you the cheat. Continue through and he will disappear and give you the All Upgrades cheat. Note: You have a short period of time to reach the orange civilian, so move quick.

All research
Play through the game until getting to Episode 6 (Zerg/The Last Episode) X-06: The Amerigo in Brood War. Reach the part where the Marines shoot the Zerglings in the pen. You will also see a cage full of animals. Get Kerrigen to the bottom left of the pen to get the cheat.

Info mana
Play through the game until getting to Episode 6 (Zerg/The Last Episode) in Brood War. Successfully complete the last round on that episode to unlock the Info Mana cheat.

Mega build
Play through the game until getting to Episode 6 (Zerg/The Last Episode) in Brood War. After you save the first two hives in the first level, go down into a corner and you will see a data disc. Touch it to unlock the Mega Build cheat, which allows you to build faster.

Fog of war off
Play through the game until getting to Episode 3 (Protoss) X-03: Legacy of the Xel 'naga in Brood War. Go to the small island after Corsairs fly by at the beginning of the mission. Touch the white flag to unlock the cheat.

Open tech tree
Play through the game until getting to Episode 3 (Protoss) X-06: Into The Darkness in Brood War. When the mission begins, go down the hall until you get to the stairs. Do not go down the stairs -- instead turn to your left and proceed down the hall. The adviser will tell you to turn back. Go back a short distance, then go back toward the dead end to get the cheat.

Bonus mission
Successfully complete level nine in the Zerg Brood War Episode with at least five minutes remaining.

Faster building
Repeatedly press B on a structure to build it faster.

Control all three groups
Play as the Protoss against at least one Terran group and at least one Zerg group. Use your Dark Archon with the Possess ability and possess a Drone and a SCV. After doing this you can use the drone to build Zerg structures and the SCV to build Terran structures.

Hidden sounds
Repeatedly select a person until he says a phrase that is not normally heard during a normal game.