Bird Sudoku Level 153 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 153 Strategy
Hard Level 153 uses a 8x8 board with 27 perch cells, 8 blockers, and 7 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 153 Solution
Bird positions in the solution: R1C2, R2C6, R2C7, R2C8, R4C3, R4C4, R5C6, R7C8, R8C5, R8C6.