U is for Unity

If you want to make games, Unity is a tool you should look at. It allows you to easily create games (both 3D and 2D) for a variety of platforms including Windows, Linux, Mac , Web , iOS, Android and Windows Phone. It also has a free version and if you ever need the pro version it is reasonable cheap to buy or subscribe to.

Check out some of the features in the upcoming version:

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Here are some links to get you going:

Go Nuts and build the next Flappy bird!