Gates of Babylon is a 40-line 5×4 game with a novel accumulation mechanic to win multiple spins with stacked wilds. During the base game, when gold coin symbols land, they award a ruby for the reel on which they landed. When there are 3 rubies collected for any reel, the full reel becomes wild for 3 spins, with a chance to retrigger for more! The free spins features this same collection mechanic, but once a stacked wild is awarded it remains locked for all remaining spins, giving a chance to win one massive payout after another.