Bird Sudoku Level 157 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 157 Strategy
Hard Level 157 uses a 9x9 board with 29 perch cells, 7 blockers, and 8 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 157 Solution
Bird positions in the solution: R1C2, R1C4, R1C8, R3C5, R5C6, R6C1, R7C3, R7C7, R8C5, R8C7, R9C2.