The maximum win on the Book of Dead slot game is 250,000 coins. This can be achieved by landing five of the game's highest-paying symbols, the Rich Wilde symbol, on an active pay line while playing with the maximum bet.
It's worth mentioning that the maximum win is also dependent on the coin denomination you're playing with. If you're playing with a higher coin denomination, the maximum win will be higher. Also, the online casino you are playing the game might have a cap on the maximum win, so you should check this with the casino you are playing with.
It's also important to remember that while the potential for a big win is always present in slot games, they are a game of chance and no strategy can guarantee a win. Always play responsibly and have fun.