If you manage to power from the complex six biomes in Returnal, your journey isn’t over just yet. Act 3, and the true ending remains for you to yet, and you’ll have to visit each biome once more and beat the boss in biome six another time to see things through to the actual finish.
In this guide, I’ll show you where to find the six Sunface Fragments necessary to trigger Returnal’s true ending. However, given this game randomises the levels, I can’t tell you exactly where to go to find each of these rooms on your run. I did find each of these on my first time through the biomes after beating the game for the first time, so I think the game wants you to find them.
If you can’t find any of the Sunface Fragments and you’ve beaten Act 2, make sure you’ve exerted all of the house sequences. You should have played through five of them, and the house will now say it’s “dark” if you try to visit it.
If you’re happy to watch a video showing the locations of the Sunface Fragments, that’s below for you, otherwise, keep going for the text version.