John Hunter and the Book of Tut is a 5×3 slot with 10 Pay Lines, at an RTP of 96.50%, and a maximum win of 6600x stake.

Land three or more Book of Tut symbols (which act as both Wild and Scatter), you get a set of free spins. At the start of the bonus, a single symbol is randomly selected to become the special expanding symbol. 
During free spins, whenever that symbol appears, it expands to cover its entire reel, greatly boosting the chance for high value combinations and big wins.