Bird Sudoku Level 151 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 151 Strategy
Hard Level 151 uses a 9x9 board with 29 perch cells, 7 blockers, and 7 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 151 Solution
Bird positions in the solution: R1C7, R2C1, R2C9, R4C6, R5C8, R6C1, R7C5, R7C8, R8C1, R9C3, R9C9.