Bird Sudoku Level 73 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 73 Strategy
Medium Level 73 uses a 7x7 board with 19 perch cells, 4 blockers, and 6 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 73 Solution
Bird positions in the solution: R1C1, R1C3, R2C7, R3C4, R5C7, R6C2, R6C4, R7C6.