
By NetGaming
Sink to the seabed where a mermaid keeps her treasure chests locked tight against the current. Your job is to feed the locks, because an open Chest is where the rewards come from. A Chest can hand over Wilds, Colossal Wilds, coin wins, or free spins with a multiplier applied to every win. Every symbol in a winning cluster counts toward opening one. Mermaid's Mega Chest is a medium volatility, cluster-pays slot from NetGaming. The smallest paying cluster on the 6x6 grid is five matching symbols. Gravalanche then clears the winning cluster so new symbols can fall in behind it. Free spins trigger only through the Chest, which can award up to 3 rewards. A Buy Bonus offers direct entry for 60x your stake. Here is how you play.
Spin the 6x6 grid to land clusters of five or more matching symbols.
Winning clusters trigger Gravalanche, removing symbols and dropping new ones for potential follow-up wins.
Each winning symbol contributes to opening Chests, which can award 1x1 Wilds, 2x2 or 3x3 Colossal Wilds, 10 free spins, or a coin win.
Colossal Symbols, including 2x2 or 3x3 versions, can appear in both the base game and free spins.
Trigger Free Spins exclusively through the Chest feature.
A Buy Bonus option is available in the base game at 60x your stake.
Gravalanche: Any winning cluster explodes, empty spaces fill with new symbols, and the process repeats until no further clusters are made.
Chest Feature: Every winning symbol contributes toward opening chests, which can reward wilds, colossal wilds, free spins, or coin wins.
Colossal Symbols: These can appear in both the base game and free spins, including as 2Ă—2 or 3Ă—3 forms when awarded through the Chest.
Free Spins (triggered via the Chest feature only): The Chest can award up to 3 rewards, and the reward pool mirrors the base game except for added free-spin mode effects. During Free Spins, the Chest can still award rewards, and a multiplier is applied to any win, including coin wins.
A Buy Bonus option is available in the base game for 60x your stake.
The RTP is 94.13% on Acebet.cc.
Volatility is medium, rated 3/6 by the provider.
It uses a cluster pays mechanic, paying on groups of matching symbols rather than fixed lines. It pays on clusters of 5 or more matching symbols on a 6Ă—6 grid.
Wins land on 29.59% of spins on Acebet.cc. That is roughly one paying spin in 3.
No, there is no demo mode on Acebet.cc. Gold Coins are the free way to play it.
It has a Free Spins bonus round, triggered only via the Chest feature. During free spins, each Chest can award up to 3 rewards, and a multiplier is applied to any win, including coin wins. Acebet.cc's welcome bonus can be used on Mermaid's Mega Chest.
Yes, it has bonus games. It offers a Free Spins bonus round, triggered exclusively via the Chest feature. A Bonus Buy option is available in the base game for 60x your stake.
Gravalanche removes winning clusters of 5 or more matching symbols from the 6Ă—6 grid. New symbols drop into the empty spaces, and the process repeats as long as new clusters form. Every winning symbol contributes to the Chest feature. The Chest can award 1Ă—1 Wilds, a 2Ă—2 or 3Ă—3 Colossal Wild, 10 free spins, or a coin win. Any symbol can be colossal in the base game and free spins.
Yes. New players get 10 SC free at signup with code ACEBET, no purchase necessary, plus a 200% bonus on a first Gold Coin purchase up to 10 SC. Bonus SC carries a 1x playthrough before it can be redeemed. Both can be played on Mermaid's Mega Chest. Claim the no deposit social casino bonus. You must be 18 or older, and eligibility depends on where you play from.
It is a medium volatility slot with a 29.59% hit rate. The Gravalanche mechanic removes winning clusters and drops new symbols. The Chest feature collects winning symbols and can award wilds, colossal wilds, free spins, or coin wins. A Bonus Buy option is available at 60x your stake to directly access the Free Spins feature. For the shortest decision on the site, there is baccarat casino online.
Gravalanche is the cascading mechanic in this slot. When a winning cluster lands, the symbols in that cluster explode and are removed from the grid. New symbols then drop into the empty spaces, creating potential for new winning clusters to form in the same spin. This process continues until no more winning clusters appear.
The Chest Feature is a collection mechanic. Every winning symbol contributes toward opening chests. These chests can award 1Ă—1 Wilds, a 2Ă—2 or 3Ă—3 Colossal Wild, 10 free spins, or a coin win.
Yes, a Buy Bonus option is available in the base game. It costs 60Ă— your total stake to activate this feature.
Yes, colossal symbols can appear in both the base game and during free spins. These can include large 2Ă—2 or 3Ă—3 forms when awarded through the Chest Feature.
Here are more underwater slots from the full social casino slots library on Acebet.cc.
Mermaid's Mega Chest also sits on the gem slots list, alongside Cash Pig 2 and Thief.
RTP and volatility are set by the provider and subject to change. The figures above were accurate at publication. The in-game paytable always shows what the build is running right now.
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