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Unmarked Thermo Sudoku (1142)
Other names: Sudoku (Unmarked Thermo)
Instruction:
Place a number from the range 1-X in each unnumbered cell in the grid such that each row, column and marked box contains each number from the range 1-X exactly once, where X is the number of cells in each row.
Several "thermometers" in the grid each indicate a sequence of cells. The numbers in a thermometer must be strictly increasing (no duplicates) from one end of the thermometer to the other. You are not told which end is which.