Puzzles:
1-10
11-20
21-30
31-40
41-50
51-60
61-70
71-80
81-90
91-100
101-110
111-120
121-130
131-140
141-150
151-160
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Hint to puzzle 6: Ant on a box
The shortest path is a
straight line
over the top of the box.
