Alien Invaders is a five-reel slot with 20 paylines and high volatility. On each spin, 3 to 5 symbols can land on every reel, and the game uses a bottom-row mechanic: when at least three matching symbols appear there, the relevant reels activate and matching symbols explode to form a win. The base game starts with a 1x win multiplier, which increases by 1x for every 10 symbols that explode in a spin.
Wild symbols on reel three can pay when they land on the bottom row and may carry multipliers up to 25x in the base game. Scatter symbols also have a role in the action, triggering explosions when they reach the bottom row and affecting adjacent symbols in all directions. With three scatters, the free spins feature begins with seven spins, plus three additional spins for each extra scatter.
This demo version lets players play for free and practice before playing for real money. During the bonus round, win multipliers carry over between spins, and wilds can hold multipliers up to 100x, creating a different pace from the base game. The published RTP is 95.48%, with bets ranging from 0.2 to 240.