Bird Sudoku Level 31 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 31 Strategy
Medium Level 31 uses a 7x7 board with 19 perch cells, 7 blockers, and 8 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 31 Solution
Bird positions in the solution: R1C2, R1C4, R2C4, R2C7, R3C7, R6C1, R6C2, R6C5.