Bird Sudoku Level 170 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 170 Strategy
Hard Level 170 uses a 9x9 board with 29 perch cells, 8 blockers, and 6 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 170 Solution
Bird positions in the solution: R1C5, R1C6, R1C7, R2C9, R3C1, R6C4, R6C6, R8C2, R8C9, R9C4, R9C5.