(57) It is disclosed the slot machine 1, in which when it is determined that the "colorless
effect" process utilizing the colorless 7 symbol 193 is done (S33) and for example,
the winning combination of the red 7-red 7-red 7 is won, two red 7 symbols are automatically
stopped and displayed along the pay line, thereafter the colorless 7 symbol is stopped
and displayed along the pay line (S37). Further, after 0. 5 seconds are elapsed, red
color is added to the colorless 7 symbol 193 by displaying red color in the area superimposing
with the colorless 7 symbol 193, thereby the colorless 7 symbol 193 is displayed as
the red 7 symbol (S38). And in the free game conducted continuous to the base game
based on that the trigger thereof is realized, when the specific winning combination
(red 7-red 7-TRIPLE or red 7-red 7-DOUBLE) is won, the red 7 symbols are stopped on
the pay line on the left reel 220 and the center reel 220 and the first divisional
symbol "LE", which is obtained by dividing the word "TRIPLE" or DOUBLE" into two,
is stopped, thereafter the symbols are scrolled on the variable display portion 24
corresponding to the right reel 220 and the other second divisional symbol "TRIP"
or "DOUB", which forms the word "TRIPLE" or "DOUBLE" in cooperation with the first
divisional symbol "LE", is stopped on the pay line.
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