Normal sudoku rules apply. Placing correct digits will clear the fog from surrounding cells, possibly revealing more clues. A clue outside the grid indicates the digit which has to be placed in the Nth cell in the corresponding direction, where N is first digit. All lines in this puzzle are thermo lines. Along those lines, digits strictly increase starting from one end of the line. The direction has to be determined by the solver. Only the hollow line branches and it does so from the lowest digit. Each line has its own color (and thickness) and lines of the same color are connected.
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