So, this isn't going to be an actual guide, per se, because there really isn't much to it; the only reason I'm putting it here, is so I don't have to reiterate it multiple times.
If you want to find out what the known cube spots are, either check the stage articles on robopedia (customrobo.wikia) or just ask me. On the most part, I've been to lazy (shocker right thar) to add most of the cube spots I know of to the site.
Anyway, onward to the guide!
A 'cube spot' is the area you fire your cube to minimize the bouncing effect. It's really a simple concept, but because the physics in this game are completely retarded, so you can't really try to calculate where it will land; it's something you just have to test.
Several things to mention about finding cube spots: Holding down the 'A' button from '3' to '2' fires you farther than normal, and holding it down as soon as it hits '1' fires you even farther.
Now, I want to talk a little about the advantages of finding and utilizing cube spots in competitive play.
Getting you cube up as fast as possible is useful for two things, which are actually just differenct sides of the same coin:
1.) To get off a high combo really quickly, before your opponent has time to respond to it.
2.) To get away from you opponent, whether for evasion purposes, or to get the advantage offensively.
I've actually gotten 1000 damage combos on people before they've even gotten up. Most times, that won't happen, but you can still get high combos to give you an edge early on.
It's pretty much absolutely needed in a real competitive battle, because everyone uses them, so if you don't get up fast enough, you're dead. And you'll most likely lose the battle because of it.
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Anyway, woo, short, probably useless guide.
~Sylar