I remember the very first time I happened on this event. I was out traveling but felt bored, so I decided to download an updated at the time version of the game.

Turns out that someone (Referred in-game as Jekyle) added a small simple event in which the main character can dress up as santa and give a present to her "inverted color scheme clone" then wake up.

Still, the event was in my mind despite its relative simplicity. Here is a representation of it, using isometric as I feel I don't use such a perspective enough. Enjoy it!