Logic Masters Deutschland e.V.

Normal fillomino rules apply: divide the grid into orthogonally-connected regions such that regions of the same size don't share an edge. Each cell within a region contains a number equal to its size.

Thermometer: there is a single invisible thermometer that travels along a path of orthogonally-adjacent cells without branching. Along the thermometer, numbers in cells are strictly increasing (that is, each number is greater than *and not equal* to the last). Cells with a small square are visited by the thermometer; the other cells in the thermometer, as well as the direction in which the thermometer increases, must be deduced by the solver.

Links: Penpa+, CtC