The dexterity puzzle from the back of a drawer, rebuilt as physics. Tilt your phone and the ball bearings roll.
About BB Roll
A dial, a few ball bearings and the tilt of your phone. Work them through the gaps in the rings until every one is resting in the middle, and hold them there for a second. Tip the phone too far and they roll off the edge.
The balls are not animated. They are rolled: a sphere on a slope accelerates at five sevenths of gravity, loses speed to friction and to the air, climbs the lip of a groove only if it is moving fast enough, and knocks its neighbours aside with the bounce its material would really have. Steel on plastic skitters. Nylon on wood crawls. Wood on wood barely wants to move at all.
Four levels change the maze, the number of balls and what everything is made of, from two balls and one ring to five balls and three. Practice has no objective and decides nothing for you: pick the balls, the board, the friction, the sensitivity, the spacing of the grooves, and just roll.
Every maze is generated, so the gaps are somewhere new each time. One worth keeping can be saved by name and loaded again whenever you want it.
Features
- Real rolling physics, not an animation
- Four levels: easy, medium, hard and impossible
- Practice mode with everything under your control
- Steel, nylon, plastic and wooden balls on plastic or wood
- Friction, sensitivity, ball count and groove spacing
- A new maze every time, and a name for the ones worth keeping
- Reset levels the dial to however you are holding the phone
- Calibration screen that times a roll and checks it against the tilt
- Optional gyroscope, for a dial a knock cannot jolt
- Plays offline, no account needed
- 25 languages
See it in action
More in the BB Roll videos.