Kingdom Hearts 2.5 Walkthrough Part 1 - Space Paranoids

When you make it to Merlin's house, Cid tells you to go find Leon at the computer room over in Ansem's study. Where's that? Head through the Bailey and onward beyond the lookout spot. You will find it once you pass through the Postern. You will also meet Yuna's Gullwings along the way.
# Treasure Location
06 Map Postern. Found by the west wall next to some railings.
07 Mythril Gem Postern. On a pipe next to the Restoration Site exit.
08 AP Boost Postern. At base of winding incline northwest of area.
09 Mythril Stone Corridors. Can be found while exploring the area.
10 Mythril Crystal Corridors. Can be found while exploring the area.
11 Hi-Potion Corridors. Can be found while exploring the area.
12 AP Boost Corridors. Can be found while exploring the area.
13 Skill Recipe Ansem's Study. Can be found next to Leon.
14 Ukelele Charm Ansem's Study. At hallway leading to Computer Room.
Once you make it to the Restoration Site, beat-up all the Heartless that oppose you. Use the skateboard you find here to make this a little easier. Treasure 14 appears after returning from Space Paranoids the first time.
 
Next, you will find Aerith chillin' on the Postern. Speak to her and move on down the stairs to the area she directed you to. Once you are in the Corridors make your way through the paths, fighting Heartless and opening treasure chests along the way. You will eventually find Ansem's Study, and after chatting with Tifa. When Donald and Goofy find a way to somehow break the computer, everyone gets taken to Space Paranoids.
Space Paranoids
Surprise! You're in jail. Or a Pit Cell rather. You cell mate is the famous byte size character, Tron. Although none of his fancy tricks can spring you guys just yet, use the TRIANGLE BUTTON to open the door. Leave here and use the lift to get to Canyon where you can access the energy core.
# Treasure Location
01 Map Pit Cell. Just beyond the door unlocked by the keyblade.
02 Mythril Crystal Pit Cell. Just beyond the door unlocked by the keyblade.
03 Mega Potion Canyon. Climb up the incline to north and turn left.
04 Mythril Stone Canyon. This one is on a ledge on top of the incline.
05 Mythril Gem Canyon. Head left from where Treasure 03 was located.
06 Drive Recovery Canyon. Found just to the north of the starting point.
07 Tent I/O Tower Hallway. Found not far from start point.
08 AP Boost I/O Tower Hallway. Found right next to Treasure 07.
09 Map Communications Room. Found opposite of Treasure 10.
10 Gaia Belt Communications Room. Found opposite of Treasure 09.
Here you are presented with your next mini-game. The idea is to hit the red box in a game of "guess which one." Several digital boxes will drop down from the ceiling. Watch the red box as it spins around the room, and when the spinning stops, attack the group of boxes where you think the red one stopped at. After attacking the red box, it will pop up. Simple.
 
Go back to the Pit Cell and access the computer. It's time to leave. You guys are going to come back and help Tron in a sec, but first you need to find the password get Tron into the Dataspace. Once you're in the Research Lab, you should walk out and run into Mickey. He helps you figure out the password. Now it's time to head back to the Pit Cell. Instead you are transported to the Game Grid where you're expected to have no fun and die! This happens to be where you test out the Light Cycle.
 
The left analog stick moves you around, L1/L2 are for making left turns and R1/R2 for making right turns. The X BUTTON is for attacking, SQUARE for charge, and CIRCLE for guard. You have to beat 5 heartless first. After that, you have to race to a hole in the wall, but of course Heartless are not going to make that easy. Delete them; head for the hole.
 
From the Pit Cell return to the Canyon. Go up the Ramp around the corner and through the donor outlined with the red. This is the Dataspace. Tron wants to access the computer here, but of course it's not easy either. You must fill the Clusters gauge by collecting orbs that spill out from dead Heartless, and then freeze all the three monitors located against the walls around the Dataspace area. You have two minutes, so kill efficiently.
 
That unfriendly entity known as the MCP is acting up again by trying to load a hostile program into the I/O Tower. Go protect it. The new lift will get you there lickity. Go to the Communications Room for a boss battle.
 
The Heartless, formerly known as Hostile Program, will release some orbs when you thrash him. Collect these orbs and fill the Cluster meter to use the Freeze reaction, just like you did with the monitors in the dataspace. While he's paralyzed, open a fragrant can of whoop ass all over his head. The combo limit with Tron hurt him real good, so give him a little of that. Drive forms work great as usual. But remember to avoid his lasers cause those things burn. Just remember to stay alert, beat him and get moving.
Hollow Bastion
When you leave the Space Paranoids, you have a chance to catch-up some more with Mickey as he will fill some key plot points. All of sudden, the gang hears and rumbling and head outside to check it out. As it turns out, the heartless are on the move (thousands of them) and it's time to go to war. Fight and beat enemies as they come. You'll run into Sephiroth on the Postern, but do not worry about starting beef with him just yet...
# Treasure Location
15 Moon Recipe Restoration Site. Go south from Bailey exit, hop on ledge.
16 AP Boost Restoration Site. Push further south from Treasure 16 was.
17 Torn Page Crystal Fissure. Can be found once you enter the cave.
18 Map Crystal Fissure. Can be found once you enter the cave.
19 Elixir Crystal Fissure. Can be found once you enter the cave.
20 AP Boost Crystal Fissure. Can be found once you enter the cave.
21 Gull Wing Postern. Talk to Yuna at the beginning of game's 2nd half.
Head-on through the Restoration Site and with all the Nobodies with as much aggression as you can muster. Continue to fight, and you'll run into King Mickey taking fools down left and right. He tells Sora to take-off, but the gang decides otherwise. It's now time to do battle with Demyx again.
 
This time, Demyx isn't as much of a push over. You have to beat 50 of his water clones in 40 seconds. If you fail, it's game over. You fight these guys the same way you did the first time you dealt with them, using the TRIANGLE BUTTON as much as possible. This is in fact the only way to effectively deal with them, so you can get to the real meat of the fight. You'll finally have a chance to kick Demyx's ass once you beat all the water clones. He's rather slippery, which is just about his only strong point.
 
If you stay close to him, and slash away aggressively, you'll weaken him quickly. He'll dash around and shoot geysers out the ground to evade and attack, but just jump out the way when you see this coming. When you start to get the best of him, he'll holler, "Dance Water, Dance" which summons 10 more water clones you have to destroy in 10 seconds. Your biggest opponent here is the clock. If you are unable to take them all down, it's game over, just like the challenge in the beginning of the battle. Remember to use that TRIANGLE BUTTON, and stay aggressive. When Demyx jumps in again, unleash that good Valor form on him, and he will start to weaken even more. He's fall soon enough and Sora can move on.
 
After Demyx is defeated, something happens that gets everyone hyphey, and enraged to go to war. Soon, Sora will be bashing Heartless with Yuffie at his side. Leon helps him next, then Tifa. And if you haven't already guessed, Cloud joins up with you and does an amazing job ravaging the little dark heathens. Next, you meet up with Mickey and the entire gang. Collect the Elixir, AP Boost, Torn page, and Map out of the treasure chests you see in the area. Time to engage the army of 1000 Heartless.
 
This is straightforward and not too challenging. The Heartless aren't too aggressive, so they're all basically waiting for you to bash their heads in. And that's exactly what you should do, making sure to use that TRIANGLE BUTTON and smash away. That ends-up being more tedious than anything. Just stay focused and fight until every Heartless is wiped out.
 
After the extended cutscene that reveals more of the plot. Maleficent pulls a rather unlikely deed. In a flash, the team is back on the Gummi Ship, bewildered, but safe. There's nothing left to do at this point except revisit the worlds you've been before, and face new enemies and challenges.

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