Silent Run

Silent Run is a 5-reel, 3-row submarine warfare slot from NetEnt, released in May 2013. It runs on 25 fixed paylines with an RTP of 96.1% and high volatility. Bets run from £0.25 to £125 per spin. The maximum single-spin win is 1,000x your stake; the Echo Bonus round can return up to 256,600 coins in total across its torpedo picks.

The game is built on Flash, which means availability has narrowed significantly since Adobe ended Flash support in December 2020. It runs in some specialist casino environments that still support legacy plugins, but it is no longer accessible in standard browsers on desktop or mobile. If you cannot load it at your casino, that is why.

The theme is WWII submarine warfare with a Soviet aesthetic. Reels are set against a dark underwater backdrop. High-value symbols are the submarine, battleship, torpedo, depth charge, and sea mine. The submarine pays 1,000 coins for five on a payline; the battleship pays 750 coins. Card values (A, K, Q, J, 10) fill the lower end of the paytable. The Red Lamp is the Wild, substituting for all symbols except the two Radar symbols.

Echo Wild Feature

The orange Radar symbol appears on reel 3 only. When it lands, it fires three sonar pulses across the reels, hunting for Wilds hidden behind regular symbols. Up to 14 extra Wilds can be revealed in a single activation. The win is recalculated immediately after the Wilds appear - no re-spin, no separate bonus screen. With 14 Wilds distributed across a 5x3 grid of 15 positions, nearly every active payline can be affected at once.

This is the main source of big base-game hits. The feature triggers on any spin that lands the orange Radar on reel 3, which happens with reasonable regularity given the high volatility nature of the game.

Echo Bonus Feature

The green Radar symbol, also restricted to reel 3, triggers the torpedo bonus round. Three sonar pulses find 2 to 5 torpedoes hidden in the reels. You then move to a separate screen showing a fleet of enemy ships and fire your torpedoes one at a time.

Each ship conceals a coin prize. The multipliers increase with every torpedo fired: 1x on the first shot, 2x on the second, 3x on the third, 5x on the fourth, and 10x on the fifth and final shot. If sonar located 5 torpedoes, your last pick is worth ten times the hidden prize amount. The total possible payout across all picks reaches 256,600 coins, though that requires both finding the maximum 5 torpedoes and hitting top-value ships with the multiplier progression.

Neither bonus feature uses free spins. Both resolve quickly - one activation, one result.

RTP and Volatility

The 96.1% RTP sits at the industry average for online slots, neither exceptional nor poor. High volatility is the defining characteristic: long dry runs in the base game between meaningful hits are normal. The Echo Wild can fire frequently, but the payout on any given activation depends entirely on where Wilds land relative to active paylines.

The 1,000x maximum single-spin win is modest by modern standards. NetEnt's later high-volatility releases push much further - Dead or Alive and Blood Suckers both offer higher ceiling potential. Silent Run trades raw max-win potential for a dual-feature structure where both bonuses can trigger independently in the base game without needing a dedicated free-spins round.

Budget for a minimum of 100 spins at whatever stake you choose to give both features a realistic chance to appear.

Paytable in Detail

Five of the submarine (top symbol) pays 1,000 coins. Five battleships pay 750 coins. Three submarines pay 150 coins; three battleships pay 100 coins. The mid-tier symbols - torpedo, depth charge, sea mine - pay between 400 and 600 coins for five, and 50-80 coins for three. Card values pay 25-150 coins for five depending on rank, and nothing for two of a kind. All pays are multiplied by your coin value, which runs from £0.01 to £0.50 per coin across 25 lines.

Graphics and Sound

As a 2013 Flash title, Silent Run looks dated against current NetEnt output. The 2D symbols are clean and well-drawn for their era - the submarine and battleship icons have real detail - but the overall aesthetic is simple compared to releases like Gonzo's Quest or Jack and the Beanstalk. Sound design commits fully to the theme: low-frequency sonar pings, muffled underwater audio, and minimal music. The near-silence suits the "silent run" name and avoids the repetitive looping tracks that make many older slots grating over long sessions.

Availability

Flash-based architecture limits where Silent Run runs today. The game was part of the standard NetEnt library through to 2022, when most casinos removed their Flash game catalogues following the end of plugin support. Some operators running legacy system configurations still carry it. If you see it listed at a casino using NetEnt's (now Evolution-distributed) back catalogue, it requires a compatible browser environment or a casino that has maintained Flash support through alternative means.

Similar Games

For the military-theme pairing with high volatility, Jack Hammer and Jack Hammer 2 from NetEnt cover similar territory with a noir comic-book spin on the action theme. Both are HTML5 and fully available today. For the Wild-heavy base-game mechanic specifically, Twin Spin delivers regular Wild clusters without a bonus feature dependency. Starburst uses expanding Wilds with re-spins at lower volatility if the dry spells in Silent Run are too punishing.

Browse all NetEnt slots in our catalogue or check our casino reviews to find operators carrying the NetEnt back catalogue.

Where to Play Silent Run

These online casinos carry NetEnt games including Silent Run. Read our Donbet review or browse all casino reviews.

Silent Run RTP and Variance

Silent Run has an RTP of 96.10%, which is above average. See our highest RTP slots for the best returning games. High volatility means wins come less often but tend to be significantly larger. Explore our high volatility slots guide.

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