3. HARD: CAN YOU CRACK IT?

NEED A HINT?

1. In the top row, there are already three noughts so the spaces must be filled by crosses. 2. In the first column, the fourth space down must be a cross to avoid having three noughts together. 3. In the second row, the fifth space must be a nought to avoid three crosses together. 4. In the third row, the last space must be a nought to avoid three crosses together in the last column.