The main game is set on the Spartan Planet, a jagged rock environment with a staircase winding through its centre. In addition, the game board is composed of 5 reels, 3 rows, and 20 paylines. It can be played between 0.20 and 100. The RTP is 96.24 percent, and the maximum payout is 7,500 times the wager. Winning combinations must appear on an active payline, beginning on the left side of the grid and spanning adjacent reels. When this occurs, players receive compensation of 1.5x to 4x their wager for the 10 to A symbols or 5.5x to 15x their wager for the spears, helms, two-columned structure, zombies, or Spartans. Multipays are an integral component of the action.
Spartans vs. Zombies features two bonus bouts with multiple activation methods. Three scatter symbols on reels 1, 3, and 5 can activate either the zombies' or Spartans' bonus round, depending on the outcome of the conflict.
During the basic game, the Zombie Metre collects all visible zombie symbols and awards three hearts. One heart is lost with every subsequent turn. If the metre is full, the Zombie Free Spins feature is triggered. When free rounds are triggered or when the hearts run out, the metre is reset. The same rule applies when Spartan symbols are visible, albeit with a Spartan Metre.
When triggered, 10 free spins with an x2 win multiplier are awarded. Before the round begins, however, players receive two shield picks that may disclose free spins or win multiplier increases. In this bonus, reels 2, 3, or 4 may become completely wild for the current turn. Each scatter that lands grants an additional free turn.
In this round, 10 free spins are awarded, with an additional free spin awarded for each scatter symbol that appears during the feature's duration. There is a chance that 1-2 Sticky Wild symbols will be added to the reels during each free turn. If2 are, the multiplier for the second Sticky Wild is x2-x10. Multipliers affect the victories they are a part of, and when multiple multipliers are used, the values are added.