A Unity3D Game Engine Tutorial. This tutorial is now dated, however a Hack & Slash 5 is in the works.
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Pro Huge number of follow-along videos
The tutorial includes 285 walk through videos that can be used to follow along and see how Unity really works.
Pro Fantastic teacher
Con Some tutorials are dated
The main draw back is that the first version of Hack & Slash is quite dated (uses Unity 3). However the author has started creating new tutorials with Unity5, including a new Hack & Slash series in the works.