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#1 .

#2 There are several art resource that come with TGB including some basic platformer/adventure art, puzzle art, and the art that goes with all of the tutorials that are included in the documentation. TGB documentation includes reference for all object types, tutorials for how to make basic games such as checkers and a casual-type of fish game, mini-tutorials about most of the features of TGB, etc. You also gain access to TDN, a repository for additional (some user-generated) tutorials and documentation.

#3 The documentation included in the Trial is the same as the normal documentation. In the Trial we want you to have a good and well rounded experience. As Melissa said you also get access to TDN (Torque Developer Network) when you purchase TGB, which opens up a handful of behaviors and mini-tutorials as well as some tutorials that are out of date, but may still be good reference for when you grow beyond the basics.