Bird Sudoku Level 57 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 57 Strategy
Medium Level 57 uses a 7x7 board with 19 perch cells, 4 blockers, and 7 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 57 Solution
Bird positions in the solution: R2C1, R2C3, R2C4, R2C7, R4C4, R4C7, R6C1, R7C7.