Walk around after boarding the Shinra No. 26 spaceship on disc two. Your party will be able to go down to the space pod or up the ladder to the right to the huge materia. Go to the huge materia and use the talk button at the tall glass to speak with Cid. He will explain the controls in this part of the game. Talk again at the case and enter the password OK [Keypad Enter], Switch [Keypad Delete], Cancel [Keypad Insert], Cancel [Keypad Insert] to collect the Key Item "Huge Materia". After travelling to Cosmo Canyon later in the game, talk to Bugenhagen. He will take your party up to his observatory. Approach to the Blue huge materia and get closer. Your party will receive the Bahamnant ZERO summon materia.
Cast magic three times at an opponent
Have all characters have Reflect status. Cast any attack spell on all three of your characters. The spell will bounce three times into the enemy, each with the attack power of a full spell.
Debug Room
For this glitch, you need two files. For File 1, you need to have the Highwind and still not have Yuffie on your file. For File 2, you need to have saved just prior to the Motor Ball boss battle. Load File 1 and land near the Chocobo Ranch, preferably in a spot you can remember as it will be invisible during the glitch. Go through Mythril Cave as normal and save just outside the forest near Junon. Load File 2 and begin the boss battle. Have a Game Over in that battle. Load File 1 again and fight in the forest until you find Yuffie. Defeat her and, instead of the scene loading that usually does, you will be warped instead into the Motor Ball battle. Defeat it. (Note that this does not necessarily allow your File 1 characters to enter File 2; rather, it just alters a value in the game's data that says "when" you are in terms of plot, so there's no item duplication or the like.) Go to the Rocket Town side of Mt. Nibel via the Highwind. Land and make sure that Tifa, Cait Sith, Cid, and Vincent are not in your active party. Go into Mt. Nibel. It will take a moment for the game to let you control the character; wait for about 30 seconds until text appears on-screen from a flashback. Scroll through it, leave Mt. Nibel, and save in the overworld. Reload this file and kill two party members in one battle. After, use the PHS to swap them out for other characters, then kill the only other one from the original group and end the next battle. Swap all three KO'ed members into the party. Enter Mt. Nibel and then get into a battle, in turn getting a Game Over. Next, load the file on which you want to enter a Debug Room. Go to the Rocket Town side of Mt. Nibel, enter a battle in the overworld, and win. After, leave Mt. Nibel and go to Junon via the Highwind. In the overworld, enter battles in the grass at random and keep escaping battles until you find one with 2 Nerosuferoth and 1 Formula (25% chance to find). Escape this battle, too, then start flying and land in the Highwind immediately thereafter, and win the next random battle you find. You will then be warped into the Debug Room.
Easy Chocobo races
Hold [Page Down] + [Target] while racing a Chocobo to slowly restore energy.
Extra money
Sell a Master level All materia to get 1.4 million Gil. Since another All materia will appear when the original reaches master level, there will be no loss in usefulness.
Nibelheim safe combination
The combination to the safe in the old mansion in Nibelheim that contains the key to enter the basement (and get Vincent) is Right 36, Left 10, Right 59, Right 97. Note: Push the button used to talk to people to select each number. After opening the safe and fighting the monster inside, a key to the other part of the mansion and Odin summon materia will be found.
Quick turn around
When surprised with a back attack, try running away to automatically turn around.
View FMV sequences
Note: The game does not have to be installed for this trick to work. Simply insert any game disc and use Windows Explorer to view the contents of the "ff7/movies" directory. Click on the files in the directory to view the corresponding FMV sequence.
Bahamnant ZERO Summon Materia ...