Enter at the S, and end at the E, collecting 100 points along the way. You may not enter the same corridor more than once.
|E |
+---+ +-+-----+
|21 |
+ +-+ +--+ |
| | | | | |
+ +-+ +--+ |
| |53 | 61 |
+-+ +---+ ---+
| 18 |
| +--+ + +-+
| | 5 | |
+--- +-+-+ 90 |
|34 | | |
+ -+- +-+ +-+
| | 13 |
+---+ +-------+
|S |
I wonder if there are other numbers available. eg reversing 18 to make 81 and 61 to make 19.
Or perhaps you collect only part of a number (one digit)?