Logic Masters Deutschland e.V.

This ruleset's primary inspiration is KNT's exceptional Japanese Sums Cave Cipher series. Going through the first few puzzles brought back fond memories of solving far too many nonograms when I was younger, so this is my take on a mix of the two. Despite the visual horror of the two puzzles you see on screen, they are actually quite approachable! However, I do strongly recommend solving the 7x7 puzzle first - this was created before I considered making a 9x9, and I believe it's a lovely puzzle in isolation (and only 2*~ difficulty!). Your feedback is greatly appreciated, and I hope you enjoy the puzzles :)

Rules
Latin Square: Place the digits 1-9 once each in every row and column of the main 9x9 box.

Cave: The main box and the 6x9 boxes above and to the left must be shaded to form a valid cave; all unshaded cells are orthogonally connected, and all shaded cells are orthogonally connected to an edge of the grid.

Japanese Sums: Within the two 6x9 boxes, unshaded cells are valid Japanese Sums clues, and shaded cells are liars (these can be ignored). Valid Japanese Sums clues give the sum of contiguous runs of unshaded cells in the corresponding row or column of the 9x9 box. These runs must be separated by at least one shaded cell. Each distinct letter from A-J represents some unique digit from 0-9. "?" is a stand in for any digit 0-9, but for a double digit number, the first digit may not be 0. All Japanese Sums clues are given for any row or column of the 9x9 box.

Nonogram: Clues outside the two 6x9 boxes give the length of contiguous runs of unshaded cells in the corresponding row or column, always read top to bottom and left to right. For each row and column of the 6x9 boxes, either all or no Nonogram clues are given.

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Puzzle 1: The Grotto
Solve on Penpa+
Note: this puzzle only uses the digits 1-7 for the Latin Square, but may still use 0-9 for Cipher clues and ? clues. Replace references to the 6x9 boxes with 5x7.

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Puzzle 2: The Cavern
Solve on Penpa+ (with answer check)