Bird Sudoku Level 117 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 117 Strategy
Hard Level 117 uses a 9x9 board with 29 perch cells, 11 blockers, and 7 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 117 Solution
Bird positions in the solution: R1C2, R1C3, R1C7, R5C9, R6C2, R6C5, R6C7, R6C9, R7C2, R8C6, R9C9.