Ripple up on seven
By James Kerslake
The changes should be read from top to bottom going down each column in turn.
2 - 3
4 - 7
6 - 7
3 - 4
7 - 2
6 - 3
5 - 6
3 - 6
1 - 5
6 - 4
3 - 1
4 - 1
1 - 3
2 - 7
3 - 5
1 - 2
5 - 2
7 - 3
4 - 6
1 - 7
2 - 4
7 - 4
6 - 1
2 - 1
2 - 6
4 - 5
6 - 5
3 - 2
4 - 2
5 - 3
5 - 7
3 - 7
1 - 4
5 - 4
7 - 1
4 - 3
1 - 6
2 - 5
7 - 5
6 - 2
5 - 1
7 - 6