Bird Sudoku Level 147 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 147 Strategy
Hard Level 147 uses a 9x9 board with 29 perch cells, 8 blockers, and 9 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 147 Solution
Bird positions in the solution: R1C7, R2C2, R3C7, R3C8, R5C8, R6C8, R7C1, R8C4, R9C1, R9C7, R9C9.