It's important to note that for the Attack of the Drones badge you may have to complete another level in order for it to register. I was frustrated that it didn't register after killing 2000+ drones twice in a row, but as soon as I moved on to another level and completed it, I was awarded the badge
@Christos. Red+Lime is a good choice for story mode and lower levels. However once you get to higher levels of endurance that require Grade 10+ gems, Y/L/O becomes the best option. Yellow's damage multiplier increases your damage exponentially greater than the Red gem does.
@Darkness, there's a "FAQ" in the Forum that answers questions like this.
The Red squares are squares that have a challenge amulet. The numbers and white lines represent how good you did on that level.
@Lockstep: Negative. Quantum is not 'always the smallest amount...'
In fact, in the English language, Quantum is almost never used to mean the smallest amount. Only it Physics does it mean the smallest amount. In general use as an adjective it actually means a large, significant amount.
So please, if the flash games are starting to fry your brain; shut them off, read a book (dictionary might help), then come back.