Grease

Bally's Grease: is a 10 reel 50 pay line video slot and is the first release from Bally's to use the double play feature. This enables players to play 2 games at once, hence the game is actually two 5 reel 25 pay line games on the one screen.
The game is available in penny denomination only and has a 300 credit maximum bet and a minimum bet of 60 credits. This activates all pay lines makes you applicable for all of the bonus rounds and 4 of the  progressive jackpots.

The game is themed after the 1978 movie of the same name and features many of the songs and video clips from the film. The machine can be played as a stand alone or set in a slot bank of up to 6 machines, which is often found set into the body off the famous Grease Lightening car.

Base Game:

During the base game the T-Birds Mystery Wilds can be activated, This awards anywhere from 2 to 10 wild symbols

Bonus Rounds:

Year Book Bonus: is triggered when you hit 3 year book symbols on the 2nd,3rd and 4th reels on either game.
The Rydell High Year Book is then displayed and you use Bally's U-Spin technology to flick over the pages of the book to select your bonus game at random.

The One That I Want Free Games Bonus: you receive 5 free games on both screens and includes stacked wilds that move from right to left increasing your winnings for each spin.

Dance off Free Games Feature: you are awarded up to 50 free games. In this bonus you interact with the I-Deck to select the dance moves you want the characters to use. This can award a 5x your total bet, a wild reel or 2 free additional games.

How Cool Are You Bonus: you select a grease themed car on the I-Deck and you then watch your car race atop the display screen to either award credit values or one of the 4 progressive jackpots.

Too Pure to be Pink Bonus: this bonus is themed after the Pink Ladies slumber party. Here you are given 3 selections of wigs, make up and jewelery, to award credit values or multipliers.

Your Pick Bonus: you are given a choice of either The Pink Lady, Rydell High or T-Bird themed bonus. After which you pick your favourite character from that theme, which awards credit values.

The top progressive jackpot can be won when 10 scattered Grease symbols appears on any pay line when playing max bet.