Bird Sudoku Level 159 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 159 Strategy
Hard Level 159 uses a 8x8 board with 27 perch cells, 8 blockers, and 6 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 159 Solution
Bird positions in the solution: R1C1, R2C1, R2C4, R2C6, R3C6, R4C2, R5C2, R7C2, R7C7, R8C5.