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I recently found a calculator for it while online, which has allowed me to get coins quickly and without fail, so I thought I'd pass it on. You just input the values and what value turns over and you're almost guaranteed a win. http://esper.vacau.com/voltorb/index.php?mode=calc
I, myself find VF pretty boring, so if there's an easier way for me to get coins, I'll take it. And the misconception is that blue squares are guaranteed wins, they just have a higher chance of being something good, as determined by the calculator. Luckily you can lose one and stay on the same level game.