Bird Sudoku Level 135 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 135 Strategy
Hard Level 135 uses a 9x9 board with 29 perch cells, 11 blockers, and 6 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 135 Solution
Bird positions in the solution: R2C1, R2C7, R2C8, R3C4, R3C5, R4C2, R4C8, R7C6, R8C4, R9C7, R9C9.