Bird Sudoku Level 81 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 81 Strategy
Medium Level 81 uses a 8x8 board with 21 perch cells, 6 blockers, and 9 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 81 Solution
Bird positions in the solution: R2C3, R4C8, R5C1, R5C5, R5C8, R7C6, R7C8, R8C3, R8C6.