Spend 10 coins to start as a size 2 pixel. The falling rate of the 2 pixel box is greater than the 1 pixel box, giving you a better easier chance of becoming a mega pixel quickly. Avoid being a size 1 pixel, because crashing into it gives you no benefits but still reduces your size. Stay away from it and the other smaller shapes. Only aim for the bigger shapes that fill the Mega Pixel meter faster. Remaining at a size 3 or 4 pixel is the safest way to navigate. Crashing into a shape will not cause too much trouble, and you will still be able to be mobile enough to slide between other shapes. Larger sizes will result in a speed that may be too fast.