Following that, a combination of symbols will be revealed as the reels spin and stop. The player will be compensated according to the value of the symbols and their wager if they form a winninggre exam slots combination on the payline. Additional Features & Unique Symbols. Bonus rounds & special symbols are common features of 777 slots in addition to the standard gameplay, which can improve the overall gaming experience. For instance, some 777 slots have scatter symbols that can initiate bonus games or free spins, as well as wild symbols that can be used to create winning combinations.