Alien Invaders

Alien Invaders is an online slot created by Pragmatic Play, designed for players who appreciate sci-fi themes with an extraterrestrial twist.

In addition, the game introduces a distinctive pay system alongside several in-game features, all intended to enhance the potential for more rewarding and engaging sessions.

Gameplay Features and Bonuses

Alien Invaders is played on a 5-reel grid, with each reel displaying 3, 4, or 5 symbols randomly on every spin. The bottom row is always marked, and winning combinations are formed when 3 or more identical symbols land on this marked row. When a win occurs, the reels containing matching symbols become active, and all instances of the winning symbol on those reels contribute to further combinations. Moreover, the game offers an RTP of 96.50% and comes with high volatility.

Tumble Feature

After each spin, winning combinations are paid out, and the winning symbols are removed from the reels. Remaining symbols fall to fill the empty positions, and new symbols drop from above. This tumbling process continues until no new winning combinations are created. Once the tumbling sequence ends, the total win from that base spin is added to the player’s balance.

Wild Symbol

The Wild symbol substitutes for all symbols except the Scatter. In the base game, it appears only on reel 3, while during Free Spins it can land on reels 2, 3, and 4. The Wild remains inactive until it reaches the bottom, marked row; above that, it is displayed but does not function. When active, it can carry a random multiplier of 1x, 2x, 3x, 5x, 10x, or 25x.

Scatter Symbols

These symbols can land on any reel. When a Scatter hits or reaches the bottom row, it explodes along with all symbols directly adjacent to it—vertically, horizontally, and diagonally. These exploded symbols are treated as winning combinations and paid according to the paytable.

Win Multiplier Feature

Each spin begins with a 1x multiplier. For every 10 symbols removed through tumbles or Scatter explosions, the win multiplier increases by 1x. Additionally, if a Wild symbol reaches the bottom row, its multiplier is added to the current total. This win multiplier is applied to all winning combinations as they occur.

Free Spins

Landing 3 or more Scatters across a base spin and its resulting tumbles triggers the Free Spins feature. Players receive 7 Free Spins plus 3 extra spins for each additional Scatter beyond the third. During this round, all reels start with 3 symbols, but after each spin, one reel may randomly increase by 1 symbol, up to a maximum of 5 symbols per reel.

Once increased, a reel retains its new size for the rest of the round. The win multiplier builds throughout and carries over from one Free Spin to the next. Any Scatter that reaches the bottom row during the round adds 1 additional Free Spin. In this feature, Wild symbols can carry multipliers of 1x, 2x, 3x, 5x, 10x, 25x, 50x, or 100x.

Ante Bet

Activating the Ante Bet option doubles the chance of triggering Free Spins by increasing the number of Scatter symbols that can appear on the reels.

Buy Free Spins

Players can also access the Free Spins feature directly through one of two buy options:

• Regular Free Spins: For 65x the total bet, the standard Free Spins feature is activated.
• Super Free Spins: For 400x the total bet, the Free Spins feature begins with a guaranteed starting multiplier of 50x.

Design and Soundtrack

Alien Invaders places players in a visually rich, alien-themed setting. The backdrop depicts a distant planet under a sky shaded in dark blue, purple, and pink, complete with stars and occasional shooting stars. An animated alien character floating in a spaceship adds a dynamic element to the scene. Furthermore, the reel grid is packed with thematic symbols, including 10-A figures designed to resemble aliens, along with four unique alien characters.

This visual setup is complemented by a space-themed soundtrack that reinforces the atmosphere and fits the aesthetic seamlessly.

For players interested in similar sci-fi slots, Galactic Invaders by Pear Fiction Studios and Invaders Takeover by Light & Wonder offer alternative experiences with related settings and mechanics.

The Bottom Line

Alien Invaders stands out with its dynamic pay system, active reel mechanic, and symbol tumbling, all of which keep the gameplay moving. The Wild multipliers and Scatter explosions add extra chances for winnings, especially when combined with the increasing win multiplier.

Additionally, the Free Spins round further enhances the experience with expanding reels, persistent multipliers, and high-value Wilds. Moreover, the optional features like the Ante Bet and two Buy Free Spins modes give players added control over their sessions, making this slot feature-rich and strategically engaging.