The case notes
What lies between the circles
Every digit on the line lies strictly between the digits in its end circles. Watch a worked example, then try the idea in a puzzle.
Put it into practice
The circles set the limits
This line has a circle at each end. The digits inside the circles set the limits for every cell between them.
Greater than 2 · less than 4
The end digits are two and four. The middle must be greater than two, and less than four. Equal to either end will not do.
Only 3 fits
That leaves three. Two, three, four: the line rises here, but the rule would work even if the larger end were first.
Read the transcript
This line has a circle at each end. The digits inside the circles set the limits for every cell between them. The end digits are two and four. The middle must be greater than two, and less than four. Equal to either end will not do. That leaves three. Two, three, four: the line rises here, but the rule would work even if the larger end were first.
