The format began with Book of Ra and grew with Book of Dead and the titles that followed it. The editions differ in paylines, RTP builds and how many expanding symbols one round can collect.
Book slots with expanding symbols
The book mechanic in short: one symbol that is wild and scatter together, and free spins in which a randomly chosen symbol expands over whole reels.
| # | Game | Provider | RTP | RTP | Max win |
|---|---|---|---|---|---|
| 1 | Book of Dead | Play'n GO | 96.21% | 96.21% | 5,000x |
