If you are playing Class II slots, which are bingo-based machines, it's impossible to give you any advice becasue you are playing bingo.

If the machines are regular Class III Vegas-style slots, then I believe that those machines are called modified multipliers, or also bonus multipliers.

Slot expert John Robison just wrote a story for the newsletter about all kinds of slot machines and when you should play maximum coin.

Read his story on the following page: http://www.americancasinoguide.com/T...on-slots.shtml

Be sure to read about 'Bonus Multipliers' because I believe that is the machine you are playing (if it's a class III slot).