The squares are made up like this:
DC - Double crochet
ch - chain
Sl st - slip stitch
- Magic ring, chain 3,
- In magic ring: 2 DC, ch 1, (3 DC, ch1) 3 times. Pull magic ring tight and join to first ch3
- Chain 3, turn
- Next row: 2DC in corner next to ch3, ch1, 3DC in same corner, ch1, *(3DC, ch1, 3DC) in next corner, ch1. Repeat from * 2 more times to complete the square. Sl st to join to the ch3 and finish.
Now I know that is not as neat as normal crochet patterns as I'm not used to writing them out, but I hope it makes sense.