One-stroke game for Touhou app for iPhone and iPad

This puzzle game is one that I am sure many of you have seen before.
The rules are simple, but it is actually an extremely deep game that requires some serious thinking to solve.
Its perfect for exercising your brain with some simple and fun puzzle solving!

How to play:
Its super easy to play!
Draw the figure with one continuous stroke!
There are plenty of stages with lots of variety!
-An arrowed line must be drawn along the corresponding direction.
-A numbered line must be drawn in the corresponding turn.
-A Red line must be drawn twice.

All for free:
Get hints for and see answers to puzzles you are having trouble with, all for free!

This is secondary creation of "Touhou Project".
Sound by Wingless Seraph
Illustration by 庵田チカ