05152529 is referenced by 446 patents and cites 12 patents.

A game machine displays in a display window a first and a second series of symbols in a column such that the first series of symbols are movingly displayed and thereafter a predetermined number of stationary symbols of the first series are displayed in a display window when the first series stops. If at that time a specific symbol of the first series, e.g. an opening or a transparent area, stops in the display window, the second series of symbols displayed in the position of the specific symbol are moved, and then a symbol of the second series is stopped in that position, whereby an additional game can be played in connection with the second symbol series.

Title
Game machine
Application Number
7/560583
Publication Number
5152529
Application Date
July 30, 1990
Publication Date
October 6, 1992
Inventor
Kazuo Okada
Tokyo
JP
Agent
Young & Thompson
Assignee
Kabushiki Kaisha Universal
JP
IPC
A63F 5/04
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