Don't stop hero on Puzzle

- How to play
http://apps.icoc.co.jp/en/?p=125

- Story
Hero hates anything crooked.
Even quest to defeat devil, He can't allow the winding road.
So he keeps going just straight.

But if this goes on, he can't arrive even his castle.

Moreover if he can't go stragiht to bump monsters or obstructions, his quest would end up.

Please guide the don't stop hero using items for example magical direction signs and secret cave.