1) Gauge: no gauge is specified. The measurements are given for one square. 1 square = 7 x 7 cm

2) Yarn:
Color 150 = 150 g
Color 144 = 150 g
Color 109 = 150 g
Color 149 = 200 g

3) Accessories : 12 buttons (22 mm)

4) Errata: Square 1 = 64 pieces (not 57)
Square 2 = 62 pieces (not 61)
Square 4 = 52 pieces (not 54)