The frog starts on its own square and ends its route on the lily pad with the flower.

It moves only by leaps, straight along a row or a column. After every landing it turns left or right; the turns need not alternate. It never leaps straight on or back.

In every leap the frog flies over exactly one stone. A leap may be any length, and the stone may lie anywhere between the square the frog takes off from and the square it lands on.

The frog flies over every stone exactly once. It never lands on a stone.

The route never crosses itself or comes back. A square the frog has landed on or flown over is taken, even if it is water or the starting square: no later leap lands on it or flies over it. The frog never flies over the lily pad with the flower: it lands there only with its last leap.

You draw the route from the frog: tap the square the frog should land on, and a leap is added. Tapping a square the frog has landed on takes back that leap and every later one.

With Crosses on, tapping a square puts a cross on it or takes it off. Crosses are your own notes; the game does not check them.

Learn the solving techniques