The pattern uses US terminology. I have used light worsted yarn to crochet the Cupcake and a 3.5mm (E-4) hook.
The pattern uses:-
Magic ring
Single Crochet
Slip Stitch
Crocheting in the round
Chains
Crocheting in Back loop only
Crocheting in Front loop only

In addition to normal crochet supplies you will need seed beads and a split ring. This is the perfect pattern for using up your stash as the Cupcake uses less than 25g of each color.

This pattern would suit someone with an intermediate skill level.

The finished Cupcake key chain is 4” inches high including the key ring and 1” 3/4 inches wide.

Due to small parts the finished key chain is not suitable for young children.