1) When you complete either game, a password will be provided. If you attain Dawn's password, you will use that password in Flow and vice versa.
2) By putting in that password, several new things will happen in the game you are playing in addition to being given an item that was only in Dawn/Flow.
3) By completing the new content, you will eventually find a new areas and a dungeon to explore. The dungeon will be able to be entered BEFORE you complete the game, but won't be able to be completed until after you've beaten the game. The new dungeon will grant you 2 prizes (one obtainable before you beat the game) and offer up a true final encounter.
4) Upon beating this encounter, you will gain another password to unlock one final prize.
I am quite proud of how the password system turned out. Below, here are some working screenshots from the Flow of Time (Remastered).
Location of the Oracle of Secrets.
The house of secrets.
The password selection screen, with "HELLO" being incorrectly inputted.
The correct password was put in, granting the bonus content and this new treasure chest. What's inside?
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The Oracle of Secrets is already in the Dawn of Time as well! You can find her in the main village, Madrin Village.
As far as progress on the Dawn of Time, progress is coming along quite nicely. At this point, the intro sequence is done, about 30% of the overworld, and the path to level 1 is complete. Up next is to create Level 1, the Woodkin Bellows!
