I love 4″ squares for their versatility. They add color and zest when used along with larger squares, or they can be used by themselves to create entire projects, even full blankets. Also, they’re very quick to work up!

This square uses about 9 yards for each color in worsted weight.

This pattern is written in US terms.
Skill level for this square is EASY.
There is a chart.

Yarn: Worsted/Aran
Hook: G/6 (4mm)
Final Size: 4”
OR
Yarn: DK/Sport
Hook: F/5 (3.75mm)
Final Size: 3.5”