In this very old game we act as a nice frog that has landed, nobody knows where,
on an alien planet.
The surface doesn't seem to hide any surprises till our unlucky friend falls
down in what seems a bottomless well. On the contrary; a bottom exists and from
down there we must, by strenght of jumps, try to reach the top of the hole
But beware of the flying dragon that comes out suddenly and doesn't expect other
than to have a snack (it's a frog-eater).