Logic Masters Deutschland e.V.

This puzzle was made for the CTC Secret Santa 2024 event as a gift for Agent, who gave permission for me to publish it here. As my first Secret Santa event and the first non-sudoku I've set, this was a very fun experience and probably my favorite puzzle I've made so far :)




Rules:
Fillomino:
Divide the grid into regions of 1 or more orthogonally connected cells, such that no two regions of the same size touch orthogonally. Enter a number in each cell equal to the size of its region.

Cave:
Shade some cells such that all unshaded cells are orthogonally connected, and all groups of orthogonally connected shaded cells connect to an edge of the grid.
Each region is entirely one color (shaded/unshaded).
Candy canes are shaded, and Christmas trees are unshaded. The number in a cane or tree indicates how many cells of its color it can see horizontally or vertically combined, including itself. Cells of the other color block the vision.

Japanese Sums:
Clues outside the grid give the sums of contiguous runs of cells of the same color within the corresponding row or column. For each row or column with clues, all runs are represented by a clue and in the correct order (left to right/top to bottom). However, a '...' can represent any number of clues, including none. Some clues have digits replaced by question marks, but a 2-digit number cannot begin with a 0.

Simple Loop:
Draw a loop that moves orthogonally between the centers of cells, without intersecting itself. The loop visits all unshaded cells and does not enter shaded cells.