Doesnt make sense
This game is terribly confusing. The longer it takes to complete the race, the more points you get, but you have to do the race fast.
Collecting coins makes little difference to your score and the instructions clearly tell you not to tap when going up hill or you go slower.
All in all, not very well designed.
Wuzzup? about
Cool Kids Ninja Run - Fun Dirt Bike Games for Boys & Girls Free, v1.8