Today's square uses a random mix of double and treble crochets worked in rounds:
Round 2: treble crochet worked in each stitch from previous round, corners are two trebles two chains two trebles.
Round 3: trebles separated by one chain worked in alternate stitches from previous round.
Round 4: double crochet worked in each stitch from previous round.
Round 5: as round 3.
Round 6: as round 1.