Bird Sudoku Level 140 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 140 Strategy
Hard Level 140 uses a 9x9 board with 29 perch cells, 11 blockers, and 8 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 140 Solution
Bird positions in the solution: R2C2, R2C6, R2C8, R3C8, R5C7, R6C7, R7C1, R7C3, R7C7, R8C1, R8C7.