Bird Sudoku Level 104 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 104 Strategy
Hard Level 104 uses a 8x8 board with 27 perch cells, 6 blockers, and 8 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 104 Solution
Bird positions in the solution: R1C7, R2C1, R2C5, R3C3, R4C1, R6C3, R6C4, R6C8, R7C1, R8C3.