This game is different than the others. The Book of Ra slot's USP is (was!) it's "expanding scatter" feature. Our slot games are compatible with iPhone (iOS Android and Windows for mobile. Playing 7 lines for example, is actually recommendedif you increase the bet per line. You get given one symbol that becomes an extra scatter symbol, expanding to cover all symbols on the reel. Not like the usual Novomatic slot games for sure, Book of Ra is a huge success in the gaming business. Book Of Ra " scatter symbols in view and, like most Novomatic slots the feature frequently re-triggers. The feature round (aka bonus round) is triggered by at least 3 Book of Ra symbols on the same screen and it is very dynamic.