Bird Sudoku Level 64 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 64 Strategy
Medium Level 64 uses a 7x7 board with 19 perch cells, 6 blockers, and 5 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 64 Solution
Bird positions in the solution: R1C1, R1C4, R3C5, R3C7, R4C2, R5C6, R6C6, R7C2.