Tower Locked comes from Miroslaw Zielinski. It is a math puzzle. The target: delete one of the crucial pink circles in order that numbers left in each and every row upload as much as the quantity matched at the aspects. Similar with the columns.
I do not know what number of ranges there are. However the grids move from 4×4 to no less than 8×8. That is at degree 8, which I didn’t resolve.
The small grids are too simple. The easiest grids are 6×6 and 7×7. However there is no means to choose simply the ones.