Start from the S and move horizontally and vertically through each grid, visiting each square exactly once.  When you step on a 1, you may change direction.  When you step on a 2, you skid to the next square in the same direction (and ignore the number you are now standing on).  Here is an example of a solved puzzle: 

Each puzzle below has a unique solution.
|   |   |   |   |   | 
|   |   |   |   |   | 
|   |   |   |   | 
|   |   |   |   | 
|   |   |   |   | 
|   |   |   |   | 
|   |   |   |   | 
|   |   |   |   | 
|   |   |   |   | 
|   |   |   |   | 
|   |   |   | 
|   |   |   | 
|   |   |   | 
|   |   |   |