Game knitting is a concept as opposed to a pattern, which means it can be used to make anything you can knit, as long as it’s a simple enough shape. The book features mostly hats, but there are also examples of scarves, mitts, headbands, and cuffs; knit whatever you love most, as it works out best to game knit an object you are familiar with knitting in the first place. As you can knit any shape, you can also game knit with any yarn/needles/gauge. You could even take it further and use the concept in non-knitting projects!
Game Knitting eBook by Lee Meredith