In the 1970s Tomy manufactured a range of puzzle games contained within a plastic see-through tank filled with water. The object was to complete challenges against the physical behaviours of water. I remember the ones we had as being difficult to play but very satisfying once completed. Titles included Triangles, Ring Toss, Starball, Soccer, Basketball and even well-known games adapted especially such as Hungry Hippos and Pac-Man.
The 1979 French advert below shows four examples of the ‘Faszination’ range which were licensed by Tomy in many parts of Europe.