Spider to catch the Fly GAME. Enter JumpStep. You pay for each New Fly (Level) and each Jump.

The spider will jump along the spiral every other k-th knot (k>1) if you enter k and return.

The Game involves a Fly who lands at some knot. Spider tries to catch the Fly by jumping every second, or every third, etc... knot. This way spider tries to minimize the number of trials.

Sometimes she catches the fly easily, sometimes it is very hard to do. Why?

One learns that the optimal strategy for the spider is to jump every second, third, fifth, sevrenth, eleventh etc...

following the smallest prime numbers. All other types of jumps are absolutely useless. Also, the best hiding strategy for the Fly is to sit on prime knots.

(With brausers this is just a demo)