This drill is quite versatile as well, with several approaches ranging from easy to more difficult:
1) Shoot in any order, any pocket, from either side
2) Shoot in any order, any pocket, but staying on the same side of the line
3) Shoot in any order but only in the two corner pockets
4) Shoot in order, staying on the same side, either any pocket or corners only
5) Shoot in order, alternating sides, any pocket or corners only
6) If you are not feeling challenged, bank them all in cross corner or cross side
So try this one out as well, maybe alternating from time to time with the across the table version to keep things interesting.