Bird Sudoku Level 156 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 156 Strategy
Hard Level 156 uses a 9x9 board with 29 perch cells, 11 blockers, and 7 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 156 Solution
Bird positions in the solution: R2C2, R2C8, R3C6, R5C1, R5C3, R5C9, R6C7, R7C1, R8C3, R9C3, R9C8.