Prepare for a long haul, this is essentially the boss gauntlet of the game. This guide will be written for the normal playthrough with additional notes pertaining to hard in bold. Items to pick up are underlined.
Matrix is a bit different from normal purifications. At first, you have black shapes, or in the case of the beginning, black rings. Purifying a lit up orange section will turn the surrounding area into a light blue section. The lit up sections travel around the shape; the goal is to turn the entire shape from black to blue.
This is just as much about timing the octalocks as it is timing the location of the purification. However, once you learn a quick pattern, it's the same on Normal as well as Hard. On the second purified ring, you should have 25% purification, as well as Health Orb #1. (01/10) After this, it starts changing shapes; around 75%, it should be a double pyramid while dropping Health Orb #2. (02/10) Once you hit 100%, it drops Euphoria #1. (03/10)
Ideal score: 45k
Same rules still apply for the flower petals. Spam the petals since they give no points, if the outer lines reach the core, it fires, octalock the core. The lines move faster on Hard. When it splits the petals to multiple flowers, you need to take them individually. It's fairly straightforward if you've gotten this far.
Once that's purified, it moves onto the bloom. Just as before, it's more important to make sure you're safe instead of pushing for score. Take the octalocks when you've got a brief breather from the bullets. You won't be able to help but hit it occasionally with the tracer. Again, just like Beauty, if you've gotten this far, it's straightforward.
Ideal score: 175k
First up are some octopi. Each one takes two octalocks to purify, if you take too long they'll fire, and the second drops Health Orb #3. (04/10) After another two octopi, some eels shoot up past you, and they're mostly vertical. Like before, two octalocks and some will fire on you. The fourth and final eel drops Health Orb #4. (05/10)
You should be at 31% at the whale. The beat all but disappears here; if you're really good at keeping the beat, you can keep the octalocks going, otherwise just spam. I had on and off luck, so it can go either way. Once you zoom out from the whale, you should be at 85%.
SURPRISE WHALE. Or less surprise, since you're reading a guide. There's three more whales that act as the mantas from Evolution: one octalock and spam the rest. The second surprise whale drops Euphoria Orb #2. (06/10)
Ideal score: 300k
The humans make a return, but while the dual health bars return, it's a bit misleading. There are actually six humans this time around: three pairs of orange and purple. Like before, it's up to you which one you want to focus on first. However, all six won't be on screen at the same time, and short of using a turbo controller (which won't help gold stars) you won't be able to clear each one as it appears. You'll essentially need to just focus on whichever one you can at the time while shooting down their bullets. The camera will spin around twice as they run around you. The second time, they'll be running away from you. Spam as much as you can, because they're about to get away and lose 100%.
Ideal score: 350k
This is the most repetitive part of the stage, as it just adds more guardians each time. It starts with three guardians who circle the corrupted Lumi core. Occasionally they turn red and fire. It's easier said than done, but try to focus on one guardian at a time, as you can knock it out of the game and have fewer things firing at you. More than likely one only gets knocked out once you're close to purifying them all. With only three, it shouldn't be much trouble to you at the moment. After those three are purified, Health Orb #5 (07/10) comes out.
Ideal score: 425k
Now to do it all again with four! It can be hard to keep track of all four at once, much less aim for a specific one. Same rules apply, once they're all purified, you get Health Orb #6. (08/10)
Ideal score: 500k
Five? Don't be preposterous, it's time for six. This one behaves more like Beauty, in that the core is firing at you while the guardians are all passive. Take octalock potshots after you get a breather from the bullets. On Hard, I ended up using a Euphoria here in order to prevent death. Even with this, I was still able to hit 800k by the end of Core, so don't shy away from that option if you're near death. Once these are all purified, Health Orbs #7 and #8 (09/10, 10/10) will pop out. Once you get past this point, so long as you can still mash A, you're golden.
Obtain all items in the Journey Archive.
Ideal score: 625k
Similar to Beauty's lines, there's an external circle closing in on the core. Should it reach, it fires. There are lots of tiny mantas surrounding the core. Spam A to clear them out, then octalock the core. This will repeat with no change until the health bar is depleted.
Ideal score: 725k
The corruption worms are back from Matrix, but unlike that time, they don't offer points here, so spam away. Essentially, it's the same song and dance as the mini mantas, just on a larger scale.
Ideal score: 800k
Not done yet! The credits sequence is next, which is purifying a world tree. By now you've hit your points requirement, so there's no need to go for octalocks. The tree rotates and generates new points to purify after you've started purifying others. Just keep scanning the cursor over the branches of the tree and mash A. You could always use a euphoria near the end if you're having trouble hitting the last few; it's not like the bonus is necessary here.
Giver Of Life
Clear the Journey Archive on Normal Difficulty Mode.
Clear the Journey Archive on Normal Difficulty Mode and achieve 100% purification.
Obtain more than 800,000 points in the Journey Archive on Normal Difficulty Mode.
Obtain more than 800,000 points in the Journey Archive on Hard Difficulty Mode.
For clearing all enemy types:
For 100% purification on all stages on Normal:
Clear all the Archives on Normal Difficulty Mode and achieve 100% purification.
For 100% purification on all stages on Hard:
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