In June 2011 the Microgaming casinos has added a new online slot game to play. Slot is named Power Spins - Sonic 7's. In 2012 the Microgaming casinos has added Power Spins - Atomic 8's and Power Spins - Nuclear 9's.
Such slot games were allocated from the common type of video slots to a separate category as it has unique feature. Feature was named Power Spins. It can be activated by the player independently with an extra bet. It means, that you can play as the basic slot game which has from 1 up to 9 paylines to play and a bet up to 10 coins per line; and especial slot game where 9 lines are active constantly, amount of coins per line is increased in 3x and unique feature is added.
Also Power Spins slot has the big jackpots on regular spins.
Power spins on microgaming slots
The Power Spins feature of Sonic 7's slot is a wild symbol with up to 8x multiplier value. The multiplier is added for all winning combinations with a wild symbol (2x for each wild).
The Power Spins feature of Atomic 8's slot pays left to right and right to left.
The Power Spins feature of Nuclear 9's slot is a Rolling Reels feature with cascading symbols on winning combinations.