[At some point between the beginning of the 24th and the end of the 25th, Christopher delivers (handed off in person or left at a doorstep) a Christmas gift: a note to go to a certain room in town at a certain time. There, she will find a closed room, and also Erika, who has been given the same note. They are to solve a series of closed room where the solution to each closed room leads to the next, until the final closed room (the thirteenth) which contains a bunch of delicious desserts.]
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