I have an idea for a game and want to get started as soon as I can. I've decided to use Unity because a) it's free until you start serious development b) it's widely used and relatively easy. I'm looking for a guide to help start me in the right direction. Some things I'm looking for are, - Easy to follow guide that covers 2D games especially - "Homework" with each lesson. A challenge to do on your own with no help. - preferably free. Willing to pay though I'll add more if I can think of any. Thanks in advance!