This is the fifteenth installment of the Monthly Topic Challenges with topics suggested and voted on here. This month's topic is "Multi Puzzle — two (or more) puzzles in one" (suggested by GentlePurpleRain) and will span from the 1st of October to the 31st of October. During this period, we will compile the list of relevant questions and post it as an answer to this question.
In the meantime, please go and propose and vote on future challenges!
Everyone have fun, and happy puzzling!
Link to other Monthly Topic Challenges.
NOTE
The suggestion is copied to this post for posterity.
Multi Puzzle — two (or more) puzzles in one
Create a single puzzle that has more than one valid solution, each arrived at in a completely different way.
e.g. Not a riddle that could have two potential solutions, but perhaps a riddle with a single solution, and another message hidden steganographically within the riddle.
Bonus points if the various answers to the puzzle combine somehow to either form a meta-answer or a final meta-puzzle.
This suggestion was inspired by the four Group 4 puzzles from the 2010 CISRA puzzle competition.
