Bird Sudoku Level 63 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 63 Strategy
Medium Level 63 uses a 8x8 board with 21 perch cells, 8 blockers, and 9 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 63 Solution
Bird positions in the solution: R1C1, R1C4, R2C1, R2C7, R4C6, R5C3, R6C7, R7C4, R8C4.