Iron Girl is a 5-reel video slot machine with 20 fixed paylines. The game includes a wild symbol (Iron Girl) which substitutes for any other reel symbol to help comprise winning combinations. On each spin, the best winning Villain symbols are held in place, along with any Wilds or Villain symbols that match the best winning Villain symbols (even if they are not part of a win), and a re-spin is awarded. Re-spins continue as long as Wilds or the Villain symbols that match the held Villains are added to the reels. Any Villains that are added, that match the ones held from the original spin are also held in place for the subsequent re-spins.