Curious what Ultra Stack Lion actually feels like to play? Here's our full, no-fluff take. Aruze Gaming are the provider behind it, tuning the title for a medium volatility profile, with a published RTP of 95.32%. You get 5 reels and 10 paylines, all leaning into a lion and animal aesthetic. It first went live in 2021 and still earns its place today. Top wins are capped at 5,000x your stake, a healthy ceiling worth chasing. The full verdict is below.
Written by Daniel Chen · Last updated: March 2026
Ultra Stack Lion comes to us from Aruze Gaming. Presentation-wise it's built around a lion and animal theme, and it leans toward medium volatility at a return-to-player rate of 95.32%. Under the hood you'll find 5 reels and 10 paylines.
Where Ultra Stack Lion earns its keep is the feature set. Look out for scatter symbols that unlock free spins and extra bonus rounds. Its medium variance balances steady wins with the odd larger payout. Overall it's a well-rounded slot that knows what it is.
At 95.32%, the RTP is slightly below the industry average of ~96%. While this is typical for many popular slots, players should be aware of the slightly lower theoretical return.
A balanced volatility profile with a mix of smaller frequent wins and occasional larger bonus payouts. Suitable for players who want steady action without extreme swings.
About 1 in 3 spins results in a win. This is a moderate hit frequency that balances win frequency with payout size.
Ultra Stack Lion features scatter symbols that can trigger free spins rounds. Landing the required number of scatter symbols anywhere on the reels activates the free spins feature, giving you extra chances to win without additional bets. During free spins, special modifiers may apply to boost your winning potential.
3.0 / 5 — Good
Ultra Stack Lion by Aruze Gaming is a solid offering that delivers good entertainment value. The 95.32% RTP combined with medium volatility creates a well-balanced gaming experience.