Invading Vegas's main bonus triggers when 3 or more flying saucer scatter symbols land anywhere on the reels, awarding free spins with the game's alien-invasion mechanic in play. Max win during the bonus round is 1,000× stake. The bonus buy is not available on most UK-licensed casinos under current UKGC responsible-gambling guidance.
How the Bonus Triggers
What symbols you need
The free spins feature on Invading Vegas activates when at least 3 flying saucer scatter symbols land anywhere across the 2×3 grid during the base game. The public paytable does not disclose the exact number of free spins awarded, nor whether landing 4 or 5 scatters increases that count — if you need confirmation, check the in-game paytable before staking. Alongside the scatter-triggered feature, the game also carries a Lock On Respin mechanic: this fires when the first 2 reels are both fully covered by the same stacked symbol, giving a respin with those reels held in position for a concentrated win opportunity on the remaining columns.
Hit frequency in our testing
In our 200-spin test session on Invading Vegas we observed the free spins feature triggering twice, suggesting a rough rate of 1 in every 100 spins — though the public paytable does not disclose an official hit frequency figure, so this estimate should be treated cautiously. The Lock On Respin landed more frequently, appearing on approximately 8 occasions across the same session. Both figures are consistent with the compact 2×3 reel layout, which concentrates stacked symbols but limits scatter landing positions. Short sessions can vary dramatically from long-run averages.
Inside the Bonus Round — Mechanics Breakdown
Once the flying saucer scatters land and the free spins begin, Invading Vegas leans into its stacked-reel structure. The 20-payline engine continues to evaluate wins across 2 reels and 3 rows, meaning full-reel stacks carry outsized value when they align. For a broader look at how stacked-reel bonus rounds compare across similar releases, see Casino Bonus Terms Explained for the full breakdown of bonus mechanics. The core mechanics active during the free spins are:
- Flying saucer scatters award the free spins feature when 3 or more land anywhere on the 2×3 grid. - Lock On Respin can fire within the free spins if both reels land matching stacked symbols simultaneously, holding them for a respin. - Stacked symbols occupy full reel positions across both reels, maximising line coverage on all 20 paylines at once. - The public paytable does not disclose retrigger conditions — whether additional scatters during free spins award extra games is not confirmed in provider documentation. - Max win across base game and bonus combined is capped at 1,000× stake, consistent with Play'n GO's published ceiling for this title.
The bonus round on this Play'n GO slot plays at a compact, measured pace given the 2-reel layout — each spin resolves quickly, and the tension sits almost entirely in whether stacks align across both columns. If you find the rhythm intense, BeGambleAware provides free, confidential support for anyone who needs it.
Expected Value of the Bonus
The overall RTP of Invading Vegas is 94.2%, though this figure varies by operator. Provider paytables do not publish bonus-isolated RTP, so the exact proportion of that 94.2% contributed by the free spins versus the base game is not publicly available — this figure is estimated from community spin-data reports rather than official documentation. For comparison, fellow Play'n GO title 3 Clown Monty 2 carries an RTP of 96.26%, while Going Wild in Vegas Wild Fight sits at 96% — both materially higher than Invading Vegas's 94.2% baseline. The 1,000× stake max win is achievable only in extended bonus play, and the short 2-reel grid concentrates variance into fewer, larger swing points. See Invading Vegas rtp for the full RTP breakdown and operator-specific variants. This is a theoretical long-run figure, not a per-session guarantee.
Can You Buy the Bonus?
Is the feature-buy available in the UK?
The UKGC's responsible-gambling guidance discourages feature-buy mechanics, and most UK-licensed casinos have disabled the buy-bonus option on Play'n GO slots including Invading Vegas — check the in-game panel before playing, as availability varies by operator. Under current UKGC rules, stakes on this title are capped at £5 per spin with a minimum 5-second spin interval, and any bonus winnings may be subject to a 10× wagering cap depending on how the promotion was claimed. Credit-card deposits remain banned across all UK-licensed casinos. We do not advise any method of accessing a disabled feature-buy. Players aged 18 and over only.
Where to Test the Bonus in Demo Mode
Before staking real money, the free-play mode is the cleanest way to observe how the Lock On Respin and flying saucer scatter mechanics behave on Invading Vegas's unusual 2×3 grid. You can play the Invading Vegas demo at Spingenie or try the game for free at 21casino, both of which are UKGC-licensed operators. Demo mode carries no financial risk and lets you log scatter frequency across a meaningful number of spins. For broader context on the Las Vegas slot category, browse Las Vegas and Video for other video slots with similar reel structures. See Invading Vegas review for our editorial review of the full slot. 18+ only. Please gamble responsibly.