Beginners Guide to SMG Tank
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Step 1: Line of Fire
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First, start by building a chassis with just cubes

Notice how this bot has 3 levels? This is so guns don't block each other when firing.
Also, the further apart wheels are, the better you can turn. Here the base for wheels are 5 space apart, so you can do all kinds of crazy turns without flipping over.
Next add 10 Steering Wheels, 7 top SMGs, and 3 front SMGs, to make sure you have a lot of everything.

And don't forget to throw a radar in the back

This should be good enough to get 2 to 3 kills per match.
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Step 2: Prism - Weight and Space
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Now lets make this bot look a little better. Start by replacing some of the edges with Prism. Prism has the same armor as cubes but weights half the amount.

In addition to reducing weight, prism also provide space between blocks. This let's you control how damage flow when you get hit. So let's start out simple by re-routing some damage away from the blocks below the guns.

And here's the final result