The pattern for each square comes as part of a weekly magazine (issues 1-90). The aim is for beginners to learn and improve their knitting by making squares with different stitch patterns. Each square measures 15 cm x 15 cm and there are 90 in total.

The Art of Knitting Issues 1 to 90
Tricot Facile issues 1 to 90
Stricken leicht gemacht 1 to 90
Book Mon plaid à moi ! (French edition)

Partial list of magazine issues for squares (unsure of English, French & German magazines have the same patterns in the same issue numbers:
Issue 1: Garter & Heart
Issue 2: Little Ladders
Issue 3 & 30: Garter Stripe
Issue 4: Stocking stitch diamond
Issue 5: Mock rib with garter ridges

Issue 7: Seed
Issue 8: Reverse stocking & star
Issue 9: Reverse stocking ridge