The Undefeated achievements are some of the more challenging of the set for this game, especially for all of the vehicle levels. You can't have any Extras turned on, even something like Fertilizer; make sure all Extras are off before you start a level with the intent to earn one of these achievements. Before you even attempt any of these, it's highly suggested that you buy Boba Fett and either Ben Kenobi (Ghost) or Anakin Skywalker (Ghost). Yoda (Ghost) is too slow, so just use one of the others. Ghosts will never be targeted by enemies except when in vehicles, and they'll never be able to die unless they fall in a pit. As for vehicle levels, buy the TIE Bomber since it can hold five torpedoes, and the TIE Interceptor due to its fantastic flying and shooting capabilities.
Strategies for each level of Episode IV will be provided in full below. You can also find videos for all 18 levels in the playlist link if you find a visual example to be more helpful.
LEGO Star Wars II: TOT | Undefeated
Chapter 4-1: Secret Plans
Being the first level, this should be among the easiest achievements for you to earn in the Undefeated set. It's easy enough to finish without a Ghost character, but having one will make things even faster. Most normal levels have some big skips in them that you can utilize with a Ghost, but this one is so linear that there really isn't anything to skip. You can, however, skip building the bridge early in the level by hovering over to the other side using Boba Fett, and you can skip the crane room in the same way. Once you clear the smoke in the last loaded area, you can Ghost your way over to the very end and finish the level.
Chapter 4-2: Through the Jundland Wastes
You'll get your first taste of how much you can skip in this game with a Ghost starting with this level. You can get through the entire first area without having to deal with raiders at all, and all you'll have to do is destroy the LEGOs at the start to lower the rock ledge and use the Force on the junk at the end. The next place you'll have to do some actual work is on the other end of the Sandcrawler; everything inside it is easy as pie since the worst offense you'll have to put up with are just Jawas. Dry up the swampy mud with C-3PO and continue ahead, ignoring any Tuskens you see until you have to use the Force on white pieces in the wall to the left to make a bridge. From here, you're essentially done. You won't need any more info to finish the level, but don't forget that you need to build a bridge leading from the broken landspeeder over to the two buttons in front of Ben's house. You'll have to do this just to let your other character across the gap.
Chapter 4-3: Mos Eisley Spaceport
This rather large level is made much smaller so long as you have a bounty hunter with you, preferably Boba Fett as per usual. Use a Ghost and run all the way up to the top of the starting area, using the Force on the staircase so you can activate the C-3PO panel above the doorway. Next, run over to where you'd normally build an AT-ST and kill all of the stormtroopers standing around. Instead of going through the hassle of building the AT-ST, blow up the orange blockade with a thermal detonator. Make sure you're not too close to it when it explodes, though, or you might die and void the run. You can switch to a Ghost and wait til it explodes if you don't want to run away and detonate it early. Walk through towards the cantina and defeat the enemies surrounding it to get inside.
You don't have to do anything in the cantina itself, so just head to the right and walk out. Chase the Imperial Spy until he closes the giant gray door on you, then whip out another detonator and blow up the door. The second-to-last area has a lot of stormtroopers in it, and you'll want to kill most or all of them before using a Dewback to fling yourself up to the top left. All that's left to do now is kill more troopers and the spy before you finish the level.
Chapter 4-4: Rescue the Princess
As soon as you start this level, kill the two stormtroopers hiding in the right hallway on your way to the first stormtrooper door, then build the control panels so R2-D2 can use them. Head through the door you opened up and fly across the gap with either him or Boba Fett to where most of the Minikits are from your Free Play run. This path is by far the least cluttered of the two, and you'll be able to get through it really quickly. When you get to the shield generator, it's up to you whether you want to pull the three switches on it, since you don't really need to in order to finish the level.
Continue past a door that must be opened with the Force, and you'll find another stormtrooper panel. Before you switch over to Vader (or some other imperial), destroy the black hook just to the right of the door; it'll be hidden on the ledge, and it's well worth your time to destroy it since it stops enemies from popping up to fight you as you try to open the door. Next is the wide "turnstile room", which should pose no problems, and past that is the computer room. You'll want to defeat all the enemies inside so you can freely build and activate the stormtrooper panel in peace. From here, it's a simple ghost-walk over to the elevator leading to the prison room, and nothing will be in your way from stopping you to getting to Leia's cell.
Chapter 4-5: Death Star Escape
There isn't much that you can skip in this level, but it's still an easy run nonetheless. Build your way out of the garbage chute and hop down to where the fleet of stormtroopers are on the ground in the next area. You'll need to kill them all, since you'll have to drive the little yellow car and they'll fire at you if you do. Push the big platform on the ground in place, but don't bother raising it with the turnstile. You can double-jump up to the top and pull the lever up top so you can free the vehicle below. Next, just drive over the switches and get into the next area.
You can get through this entire area without switching your two characters from Ghosts. When you end up in the tall room with the elevator (which you might have hated in the story run), you can ignore everything in here too and focus on getting to the top floor. Make sure to defeat any enemies near the stormtrooper panel at the top before you try to open it, as they'll attack on sight if you're not a Ghost or a droid. The next room consists of just a few grappling points and is easy enough to get through with just about anyone. Past this is the long hallway leading to a stormtrooper ambush. Thanks to your Ghost, you can build up the entire doorway without being interrupted.
In the hangar where the Falcon is being stored, stay to the left (don't drop in the large hole) and activate the R2-D2 panel so you can run over the five switches with another yellow car. You'll want to do this first since the other four activations you need to pull off don't require any other characters for very long, and you're most vulnerable in a vehicle. Best to get it out of the way before enemies show up. When the Falcon is above the shield, kill all of the enemies that pop down from above. If you've killed them all and the Falcon isn't opening up, try going back to the previous room and killing enemies in there.
Chapter 4-6: Rebel Attack
Being the first vehicle level chronologically, this is most likely going to be the first one you try to finish for its achievement. That being said, it's important that you have the TIE Interceptor and the TIE Bomber, although you probably already have these if you already went through for Minikits and the Power Brick. This level has only a few different areas, and all except the last have the same set of rules to follow. You should basically always use either the Interceptor or the Bomber, but you're going to want to switch between them depending on your circumstances. For this level, you won't have to worry about going fast or evading enemy fire all that much, so sticking with the Bomber will suffice.
The reasoning for using the TIE Bomber is that it can hold up to five torpedoes as opposed to the usual three. With targets being grouped in sets of four, this is obviously going to make things a lot easier for you. For the first area, collect five torpedoes by flying back and forth over the dispenser, then pop the initial target and head towards the first group. As you launch your torpedoes, you should be moving at all times, whether it be standard flying or by pressing and moving either / to do a barrel roll or just pressing to do a corkscrew. These two moves are going to be really important for the other vehicle levels, so don’t forget about them. When you've downed the first barrier, restock on torpedoes and enter the second area.
In this area, you'll probably be hit at least once. You should always focus on keeping your health up at all times, so shoot destructible objects and enemy fighters so you can pick up more hearts. Unlike most vehicle levels, hearts here will disappear after a little while (just like usual), so waste no time picking these luxuries up. Anyways, head to the right and wipe out the first generator here. There should be another torpedo dispenser by the barrier that you can use if you run out, and you can use these to hit the second generator just to the left of the shield. Just like before, make sure your health and torpedoes are at maximum capacity before heading into the third area.
This third area is the last one you should have to worry about. Like you've been doing, just head to each generator and fire your torpedoes, wiping out any threats in the area like turrets or enemy fighters. It's exactly what you've been doing before, so there shouldn’t be any surprises here. Now that you've only got one target to hit to finish the level, switch to the TIE Interceptor and pick up three torpedoes before heading into the trench.
For the last portion of the level, Vader's TIE Fighter and two accompanying ships will be firing at you from behind in the trench towards the Death Star's weakness. Their firing at you is just a show; none of their shots will damage you, but the turrets and other entities in the trench are a very real threat. But don’t worry about them too much. For whatever reason, You should be able to get to the end of the trench by just flying straight and firing. When you get to the weak spot, you'll have to destroy 12 turrets that guard it, which will only pop up after you fly above them. The best way to do this, of course, is to fly over only one group of four at a time, and then destroying them before moving on to the next. The Interceptor's firing range is much greater than that of the other ships, and it fires twice as many blasts to boot. The icing on the cake is its agility, which will help you avoid turret fire if you have to. When all 12 turrets have been defeated, pop a torpedo into the target and you'll finish the level.
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