The classic 33-marble puzzle. Jump a marble over its neighbour into an empty hole — the jumped marble is removed. Clear the whole board down to one.
1Tap a marble, then tap a glowing hole to jump it — over one neighbour, into the empty space two away.
2The marble you jump over is removed. Jumps are up, down, left or right — never diagonal.
3Goal: leave just one marble — and it's a perfect game if that last one rests in the centre.