Bird Sudoku Level 77 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 77 Strategy
Medium Level 77 uses a 8x8 board with 21 perch cells, 8 blockers, and 8 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 77 Solution
Bird positions in the solution: R1C1, R1C2, R1C6, R2C4, R3C7, R5C4, R8C4, R8C5, R8C8.