Bird Sudoku Level 4 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 4 Strategy
Easy Level 4 uses a 7x7 board with 11 perch cells, 3 blockers, and 3 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 4 Solution
Bird positions in the solution: R1C2, R1C5, R1C7, R3C6, R7C4.