You can access the Skatepedia by going to the main menu and selecting it after clicking the cog icon at the top-right of the ...
There are over 100 possible tricks you can pull off in Skate, and here's a look at each one and how to do them.
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How to Manual in Skate 4

A standard manual is performed by balancing on the back two wheels of your board. Here’s a step-by-step breakdown of how to perform this trick in Skate 4: Gently pull back on the right analog stick.