Varikon Towers

Circa 1980's except the custom 2 section version purchased 2014.
(4 section, 4 column tower is 1.4" x 3.5" with 5/8" diameter balls,
4 section, 4 column key ring tower is 5/8" x 1.75" long with 3/16" diameter balls,
2 section, 5 column tower custom made in Ukraine is 1.5" x 2.25" with 5/8" diameter balls,
5 section, 5 column tower is 1.6" x 4" with 5/8" diameter balls,
7 section, 7 column tower is 1.6" x 4" with 3/8" diameter balls)

This puzzle is slightly different from the Whip-It Towers in that instead of one column missing a ball to create the gap, there is an extra section that has the gap. However, just like the Whip-It towers, any ball can effectively be moved to any position without disturbing the others (given that all balls of a given color are equivalent), and these puzzles can be solved in any order (with any assignment of colors to columns) one ball at a time (it just takes longer when there are more columns and / or sections). In fact, if you first just park one of the balls in the gap, then this puzzle is identical to the Whip-It Towers, except at the end you just drop the ball on on the appropriate column.

Because the number of rows and columns is the same (except for the custom made 2 section version), a second problem is to put the same color ball in each row.