Theme: “23″ – Both today’s date, and a fine number for themed logic puzzles, such as the Map Puzzles from Bang 23.
Answer String: Enter the length in cells of each of the cave segments from left-to-right for the marked rows, starting at the top. Separate each row’s entry with a comma.
Time Standard: Cave Master = 3:00, Expert = 9:00, Novice = 30:00
Note: Advice on solving this puzzle (and Cave puzzles in general) has now been posted in “Ask Dr. Sudoku #4”