Returnal Hidden Ending Playthrough - Part 1

In order to unlock hidden alternate ending, All house sequences should be completed. Once that done, approaching the 80th century house will show text "Dark". This is when 6 sun face fragments will appear at different locations, each in individual biome. You can collect it in any order. Once completed, simply start the game from biome 4 and reach biome 6 and beat final boss.
This video will showcase the playthrough from Biome 4 to 6. There are two parts.
This is part 1 of playthrough.
Watch part 2 at: • Returnal Hidden Ending...
00:00 Biome 4
47:50 Biome 6