Kingdom Hearts II/Space Paranoids

First visit
In the Pit Cell, you can find a save point and a moogle. Nevertheless, your goal is to escape. Attack the door to obtain clusters. Once the cluster gauge is filled, use a reaction command to break out. Tron will then join as an optional party member, though he doesn't have his limit yet. Open the two chests for a Pit Cell Area Map and a Myhtril Crystal, then exit to the Canyon. Open the first chest nearby for a Frost Crystal. Head up the ramp and open the chest in the corner for a Mythril Stone. Continue up the next ramp and open the chest at the top for a Dark Crystal to the right and a Mythril Gem to the left. Drop down to the center and examine the machine to activate a mini-game in which you must find the box that glows red and attack it. Clear the mini-game to turn the power on, then return to the Pit Cell, access the computer, and return to Hollow Bastion's Research Lab.

Second visit
Upon returning to the world, Sora will be thrust right into the mini-game of Light Cycle. You can use psx: neutral lstick to move the bike along the grid left or right, and psx: R1 and psx: L1 to turn right or left when prompted. The Heartless participating will play dirty in the race, attempting to attack Sora by hitting him or even charging into him. Each action has a different function to combat the troublesome racers: psx: X is a Keyblade attack that breaks enemy charges, psx: S is a charge that breaks enemy guards and launches them into the wall, and psx: C is a guard that breaks enemy attacks from the left and right. The most useful of these actions is the charge, as it can harm both enemies that are attacking or guarding. The first round consists of only a few Heartless, but the second will begin when a Devastator hops onto the track and will go on for much longer. Dodge all Heartless and best all obstacles to reach the end of the course, then use a guard when the multiple Devastators attack to escape safely. After the scene, Tron will rejoin the party. Head to the Canyon.

Defeat the newly-spawned Heartless as you move up the ramp, then take the right exit to the Dataspace. Access the computer at the end of the room to begin a timed battle. Rather than dropping the usual health or munny, the Heartless here will drop clusters. Fill the gauge with clusters to perform the Freeze reaction command on one of the monitors, then continue on to the next. Ignore the Heartless once the gauge is full and skip to performing the reaction command, since you're under time constraints. Clearing the task will earn Sora, Goofy, and Tron increases in maximum HP, and Thunder Boost for Donald. Exit the room after the scene and head straight to the lift. Open the two chests for an AP Boost and a Power Crystal. Head right into the I/O Tower Communications Room and open the chests after the scene for a Gaia Belt and an I/O Tower Map. Return to the Hallway once ready for a boss fight.

Boss: Hostile Program
Like the many other tasks of this world, this battle will have you picking up clusters. Attack the enemy with Drives (such as Limit Form's Ars Arcanum or the newly-acquired Master Form) and Tron's limit in order for it to drop enough clusters to fill the gauge. Use the reaction command to freeze it, allowing you to perform some combos while it remains stationary. It will eventually wake up and drop some clusters as it does, so make sure to collect them before it returns on the offensive.

The Hostile Program has a couple of attacks to look out for, but nothing too tough. From time to time, it will shoot bullets that move at a robotic pace, giving Sora an ample amount of time to dodge and even attack. Another attack has it charge at a rapid pace around the room, though it will stick close to the wall as always. It also has the ability to shoot lasers from its arms, though because its arms are separate from the body, Sora can dodge through them and continue to attack the body of the Hostile Program. Overall, while this battle's gimmick may make it stretch in length, it should be completed without much trouble. Doing so will power up Sora's drive gauge as well as earn him a new ability that lets him attack all surrounding enemies, Vicinity Break. Donald and Tron obtain a boost in maximum HP while Goofy obtains Jackpot. After leaving the world, Sora will obtain the Photon Debugger Keyblade, and the party will end up back in Hollow Bastion.

Rescue Tron
Note: Do not go straight to the I/O Tower, that will not advnce the story. You need to go to the second option on the computer terminal in the Pit Cell. This will take you to a battle where you can save Tron. Then head for the I/O Tower!