Rev It Up is a slot game for those who like to live in the fast lane. It's Friday night, and the city is filled with beautiful cars and even more beautiful women. Pick your ride and driver of choice, and then try to win one of the high-octane races you discover. Super Stacks and the Hi-Lo Stacks Bonus help you speed towards big wins! 4 by 6 reels. 50 paylines. Super Stacks and a Hi-Lo Stacks Bonus.