ORIGIN: UK Palitoy game

VARIANTS: Feed The Frogs, Lucky Ball, many more.

GAMEPLAY: Extremely basic and not particularly entertaining pinball-style game, involving nothing more exciting than simply shooting the balls into the nine target pits.

VARIANT: Feed The Frogs

ORIGIN: US Tomy Pocket Game

DIFFERENCES: Name, theme, colours and graphics. There were actually countless variations on this game, as it was licenced to many different companies.

VARIANT: Lucky Ball

ORIGIN: US Tomy Pocket Game.

DIFFERENCES: Name, theme, colours and graphics.

VARIANT: Lucky Ball

ORIGIN: US Tomy Pocket Game

DIFFERENCES: Theme, colours, graphics and layout. This model also has a different trigger style to the others, and one that's very weakly-powered. In this version, the case has a small stand that folds out 1cm or so from the back, to tilt the game on a table to the required angle, low enough that the trigger can actually get the balls onto the playfield.

VARIANT: Ball Game

ORIGIN: Unknown. Possibly Japanese Pocketmate.

DIFFERENCES: Name, theme, colours and graphics. The outhole on the left of this one is only drawn on - there's no actual hole there, and the ball is returned to the shooter if it escapes down that side.