Ninja by Endorphina — RTP & Analytics

Ninja by Endorphina features a 5x3 reel grid with 20 fixed paylines, where wins form from left to right starting on the leftmost reel. The Black Ninja serves as the wild symbol, substituting for other symbols and accumulating in a meter when landing 2 or more times: 2 wilds for 2, 3 for 5, 4 for 30, and 5 for 100, with separate counts per bet level. Three or more Black Ninjas trigger free spins, which continue until accumulated wilds are depleted, introducing variable duration and high volatility as rounds can last 2-3 spins or over 20. During free spins, an animated Black Ninja appears after each spin, striking symbols on reels 2-4; high-pay ninja symbols gain 2x multipliers that combine multiplicatively, while low-pay weapon symbols turn into additional wilds. A gamble feature allows doubling winnings by selecting a card higher than the dealer's from four face-down options. Visual style evokes 1980s action movies with ninja characters in yellow, red, blue, and black, alongside weapons like swords and shurikens on a dark, shadowy backdrop. The unbalanced paytable, with blue ninja paying up to 250x stake for five-of-a-kind versus lower symbols, amplifies swingy outcomes, distinguishing it through wild accumulation and unpredictable free spin dynamics over standard bonuses.