1. EASY: HOW TO GET STARTED

NEED A HINT?

1. In the second row, the spaces left and right of the two noughts must both be a cross, to avoid having three noughts together. 2. In the fourth column, the space below the two noughts must be a cross, to avoid having three noughts together. 3. In the fifth row, the space to the left of the two crosses must be a nought, to avoid having three crosses together.