Invading Vegas blends the glitz of Las Vegas with a comical alien invasion, set on a 5x3 grid featuring 20 fixed paylines. The game introduces a "Lock & Load" respin where identical stacked symbols on the first two reels lock in place for a free respin of the remaining reels. A full stack of Wilds on reel 3 triggers a Walking Wilds respin, moving left with each spin to create further win opportunities. Landing three or more UFO Scatters initiates the Free Spins round, during which a stacked Wild moves across the reels with every spin, providing medium-volatility potential for wins up to 1,000 times the stake.