figured it out w help of walkthrough... from postcard you get 23431 sequence, and from stripes you get the corner number. the 3x3 grid I just guessed based on the color being in all of those places at some point, although it doesn't 'make sense', per se. enjoyed it.

Postcard rack hints are impenetrable, had to use the walkthrough and I still can't reverse reason them.

Completed..nice work, but could've used medals for solving the puzzles and one for escaping...otherwise it was fun.

The frame puzzle was hard to solve, but it's doable! :D