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 |

The only sets of numbers that add to exactly 100, are

18,61,21
34,5,61
13,5,61,21
13,34,53

but none of these is accessable without re-entering a corridor.

But, being in "Tricks", maybe the intended answer is to pick up 13, 90 and 61 along the right-hand track, and claim having collected 100 points and then some.

Another possibility is that the 18, 61 and 21 are picked up; the top corridor is not re-entered, just re-traversed backward a little to get to the exit.

Edited on April 13, 2007, 10:01 am

Posted by Charlie on 2007-04-13 09:57:12