Level : easy-intermadiate. I consider this pattern easy to do,all you need to know is the basic crochet, the simple crochet.chain,
I offer many photos step by step how to do it and also you have some instructions written in standard American terms (written on photos,as my pattern is based on explanations through images )

For this pattern you will need:

-3 colors cotton ( or acrylic) –white,blue and green or what colors you like (worsted medium yarn), 3.0 mm hook , polyester fiberfill stuffing (or small scarps of cotton fabric ) ,sewing thread ( you can use yarn to sew) , a stitch marker (it is easy to count the rounds) ,tapestry needle, scissor. In my tutorial I used cotton yarn (I put the yarn in two).