The issue with Episodes V and VI is that there are two vehicle levels, if you count Speeder Showdown as a vehicle level. This makes Episodes V and VI the harder ones to get the Undefeated achievements in, but the details listed here should help alleviate the confusion. Videos for these are also provided, just like with Episode IV, so you don't have to rely on 360p videos from ten years ago.
LEGO Star Wars II: TOT | Undefeated
Chapter 5-1: Hoth Battle
People tend to have a problem with this level not only because it's a vehicle level, but because the last area is a bit of a pain. The first two "normal" areas leading up to the last are extremely easy to get through; just focus on getting bombs to where they need to be, and as stay far away from their explosions as possible. If you ever lose health, try to writhe the hearts out of rocks, turrets, and enemies. Try not to enter the last area without full health.
The first two four waves at the end of the level are comparatively easy. Since you don't have to deal with any AT-AT's just yet, switch over to the TIE Interceptor and blast away at everything you see. The AT-AT wave, the third of four, will be the make-or-break point for most. Focus solely on the AT-AT's and shoot everywhere as you circle around them. If you're lucky, you'll be able to pick up dropped hearts mid-spin if you need them. Again, don't forget to stay away from the bomb's blast radius when they explode. For the last wave, enemies will stop respawning when defeated, so switch back to the TIE Fighter and don't stop until the only thing left is the one AT-AT. With it isolated and vulnerable, you'll be able to finish the level without anything else getting in your way.
Chapter 5-2: Escape From Echo Base
Most of Echo Base is a cakewalk with a Ghost. Any turret that you try and use will incite enemies to appear to attack, but you can sidestep this by throwing thermal detonators at any barrier that would normally require a turret. Just about literally everything in the level is doable with just a Ghost and a bounty hunter, again preferably Boba Fett. When you get to the Falcon, you can deactivate the shield's two generators with detonators, and you can ignore the Tauntauns by just double-jumping onto the roof of the Falcon. It's really an easy level.
Chapter 5-3: Falcon Flight
At the start of this level, you need to destroy all 16 turrets on the tops of the four Star Destroyers in the area. Use the TIE Interceptor and you'll easily wipe them all out due to its superior firing capacity. The small size of the Interceptor means that you also (hopefully) won't take any damage, but if you do, just shoot some enemy TIE's and pick up another heart. Hearts in this level never disappear, so you can leave them be for when you need to come back to it. You'll have a bit of time to do this after you destroy all the turrets too, but if you're at full health, don't forget that you can do barrel rolls and corkscrews if need be.
When you're in the asteroid field, switch to the TIE Bomber. Each barricade that you'll ever have to break will only require four torpedoes (save for the final meteor, of course), so having five behind you is a real big help. Just pick up five torpedoes and smash the barrier at the end of this first area, but make sure you don't run into any asteroids or their debris, because you'll take damage if you're flying into them too fast. Stock back up on torpedoes and health once the barrier is down before heading into the second area of the asteroid field.
As you already know, you have to destroy two barriers here before you can access the very last area. If you followed the directions at the end of the previous paragraph, you should already have enough torpedoes for the first barrier, so go ahead and blow it up. Head to the next one and fire your last torpedo at it, then duck into the giant crater to the right. You should have already been in here if you went Minikit hunting before you started going for these achievements. In here are a few destructible objects that drop torpedoes, meaning that you don't have to fly around the asteroids anymore; on top of that, there are no enemy ships in this cave/monster, so unless you bump into walls, you won't take any damage as you collect a few free torpedoes. Fly back out and use these to destroy the second barrier, then pass to the last area.
Just like before, just take torpedoes from the meteors and fly over to the big one at the end of the level. Get that thing out of the way as fast as you can, but safely, so you can finish this level and never have to play it again (assuming you've gotten the collectibles).
Chapter 5-4: Dagobah
You should be able to get to Yoda's hut just fine with a Ghost and Boba Fett (or R2-D2). Once you're there, use the Force on his hut and jump up the path resulting from it. This will let you skip the "Force tutorial" area of the level completely since it just loops back around to Yoda's hut anyway. From here, continue onwards and destroy the big wooden blockade, then head towards Darth Vader. The path to Vader can lead to a death if you're not careful, so it might be a good idea to use Boba Fett when making any kind of sketchy jump.
Fighting Vader is made simple by just doing a Jedi slam on the ground with your Ghost every time you get close to him. When the metal gate opens, run through to the last area and fly with Fett across the sunken bridge to skip having to move the turnstile connected to it. Return to your Ghost and run all the way to the giant gate blocking you off from the X-Wing, then move a fair distance away and use a detonator on it. This will skip the whole laundry machine/motorcycle process, saving yourself a lot of time. Now all that's left to do is raise the X-Wing with the Force, which your Ghost can do without fear of being attacked.
Chapter 5-5: Cloud City Trap
Lots of this level can be skipped, as long as you have Boba Fett alongside your Ghost. It's quite embarrassing how much you can just ignore. You can start off by using the Force on the X-Wing to make part of the bridge to the next room, and you can fly over from the wing towards the other side with Boba Fett. In the next room, don't worry about the turret and instead just blow up the blue barrier with a detonator. Past this area is the first Vader fight, in a circular arena. You'll want to switch to Boba Fett and fly to the platform to the right, ignoring Vader completely as you exit the room.
Make your way to the next fight area which, unfortunately, can't be skipped. To make things go faster, keep the platform linked with the turnstile halfway up in the air so you can double jump back and forth between the panel above and the ground below. When Vader flees, chase after him to the large room with two stormtrooper hatches. Fly over to him immediately with Boba Fett, and Vader will crash through the window, allowing you to chase after him immediately. Make sure to switch back to a ghost after you land so that the troopers don't land any hits on you.
All that's left now is a small chase and the last of Vader's health, made far too easy with a Ghost's Jedi slam. Congratulations on getting another Undefeated achievement out of the way.
Chapter 5-6: Betrayal Over Bespin
You'll want both Boba Fett and a Ghost for this level. Run straight to the end of this hallway with your Ghost and double jump up the sloped staircase. If that's not working out for you, you can always repair the staircase the normal way with the switch hidden to the left. Next, run up to the bounty hunter door on the far end of the room, ignoring the Fett battle completely. Switch to C-3PO and open the door directly ahead, then run to the end of the hall as your Ghost. You'll then want to kill the stormtroopers to the left of the elevator, as they'll try and shoot you when you switch to your own or Vader to activate the elevator.
The path leading up to the Millennium Falcon will be easy enough without having to explain it. Defeat all the troopers that fall in the initial area so that the pieces for a grappling point fall, and you'll be all set. When you get to the smoky room, ignore the smoke and head straight for the Falcon. The gap that would normally be removed with the switches past the smoke can be flown over with Boba Fett, but if you want to use the bridge to be safe, switch to a droid. Your Ghost will not survive the smoke, and it'd be a pain to die at the end of the stage like that. Defeat all of the enemies guarding the Falcon to open it up, just like usual.
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