Collect all the coins and get to the exit in Sichiken.
There are two types of levels: single pass and double pass.
In single pass you can just collect the coins and get to the exit.
In double pass on your second pass you re-run the level with your old self running the path you just took.
Use this to use switches, get coins that lead to death, and get at least one self to the exit.
Enjoy Sichiken.