Book of Ra slot by Greentube was released in 2005 and remains a cult classic that went on to inspire many slot games over the years and start the "book" trend, where a special symbol is chosen to expand and cover the reel during the bonus round. If you're into slots, you will immediately feel the classic reel mechanic and the sounds of an OG Novomatic slot.
This 5-reel slot has 9 paylines and the notorious free spins round with expanding symbols that can award you 5000x your stake.
And for any slot player, it's almost impossible not to have experienced one of the hundreds of book games out there. But if you're looking for where it all started this is the game to try out!