Hey, this's REAL!!!!

Link.

Puzzling Draft

Start: 1 End: 17
-5 / +5 ((position-1±1) mod 5 = (position-1) mod 5; 1<=position<=20)
-1 / +1 ((position-1±1) div 5 = (position-1) div 5; 1<=position<=20)
[7,8,9,15,16]

Find the shortest path between 1 and 17