Bird Sudoku Level 53 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 53 Strategy
Medium Level 53 uses a 7x7 board with 19 perch cells, 5 blockers, and 8 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 53 Solution
Bird positions in the solution: R1C2, R2C5, R2C7, R3C1, R3C3, R3C5, R4C1, R5C4.