Big free balls are free-moving obstacles in the game Flipside. They only appear on level six.
Big free balls are very large and grey coloured. At its center is a circle with four knobs on each side. Around the circle is a swirl pattern.
Big free balls are large and heavy, and can knock the racer off of walls easily. They are encountered in a tunnel leading straight up, where they can fall on the racer.
It is necessary to avoid them. However, the balls can also benefit the player, as they can roll into the other racers, slowing them down or even making them get completely stuck. This will then allow the player to get a head start over the other racers.