Bird Sudoku Level 163 Hint
Pick a row, column, or habitat with a low remaining count, then check which of its perch cells are blocked by open diagonal flight lines.
Bird Sudoku Level 163 Strategy
Hard Level 163 uses a 8x8 board with 27 perch cells, 6 blockers, and 9 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 163 Solution
Bird positions in the solution: R1C1, R1C8, R2C5, R3C7, R4C1, R5C1, R5C3, R5C6, R7C7, R8C2.