The game is nice, colourful and the adventure theme with the slight Indiana Jones vibes is very well executed. The Book of Ra is an older style slot machine that's well known in the gaming community. Play Scrolls of RaHD in Casino for Real Money: Rank, bonus, play, review. Increase in reel time means an increase in the chances for players to walk away with huge winnings. The bonus features for the game include welcome rewards, wild card, and free spins. Press the - and buttons next to Lines to change the number of active paylines. As usual, all prizes are for combinations from left to right on selected lines, except of course for scatter symbols.