New Scientist puzzle #59: Celebrate the differences

#59 Celebrate the differences

Complete the diagram so that each of the nine circles contains a different digit from 1 to 9. Whenever two circles are connected by a straight line, the difference between the two numbers must be three or more (e.g. 5, 6, 8 and 9 can’t be connected to 7). The bottom-left square isn’t 1.

Answer next week

#58 Lego lockdown

There are 89 ways of combining the bricks to make a row of length 10. The combinations for length n follow the Fibonacci sequence, in which each number in the sequence is the sum of…