Entrapment

Circa 1980's?
(plastic, 3.5 inches high by 2.75 inches diameter)

The top and bottom halves of the puzzle each have three tubes that can hold three balls each. By rotating the top and bottom halves with respect to each other, balls can be moved around to get to the solved state that has one empty tube and five tubes each containing three balls of the same color. This puzzle is in a similar theme to the Atomic Chaos puzzle, but easier to solve.