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Before you choose a slot room, a live dealer table or a football market on mahyong138, it helps to know what each term actually means. This glossary covers the words you'll see across our lobby — from game mechanics and odds language to account and wallet terms — so you can browse with confidence rather than guessing.
If a definition here raises more questions — or a term appears in your account that isn't listed — our support team can clarify it directly. Reach us through the channels below and describe the screen or section where you saw the word.
Open the chat widget from any lobby page. Describe the term or section you need explained — for example, a label inside your wallet, a game rule screen, or an odds field in the sportsbook. Our team responds in the same session.
After logging in, head to the Help section under your profile. Term-specific articles are grouped by category: game rules, payment language, and account verification steps. Search the term directly to pull the relevant article.
For detailed questions about a specific term in a transaction record, game history or bonus condition, email support with a screenshot. Include your account username so the team can check your exact context before replying.
When you land on the lobby and see labels like RTP, volatility or turnover, those aren't decoration — they're filters that help you pick the right game for your session. A slot with high volatility pays out less often but in larger amounts when it does; knowing that before you open the game changes how you manage your wallet balance. The same logic applies on the sportsbook side: understanding what Asian handicap or over/under actually means lets you read a market clearly instead of placing a bet you don't fully follow. Even account terms like KYC or e-wallet verification directly affect how quickly your DANA or OVO transaction moves through the system. This glossary is here so none of those terms slow you down.
Terms don't appear in isolation — each family belongs to a specific part of the lobby. Knowing which screen a term lives on helps you find it when you need it, rather than searching the whole platform.
These appear in the game information panel before you enter a room — RTP percentage, volatility rating, paylines and bonus round triggers. On slot titles from JDB and Joker, the info icon on the game card opens this data directly.
Asian handicap, over/under, odds format and match lines appear in the sportsbook section. Football markets for Liga 1 and European competitions use these terms on every match card — tap the odds field to see the full market detail.
Deposit, withdrawal, e-wallet, rollover and KYC all appear in your account dashboard after login. The transaction history screen labels each movement with its type and status, and your wallet balance updates once a transaction clears.
Turnover requirement, wagering condition and validity period are the three terms you'll see in the details panel of any information. The current state of each offer is shown in your account dashboard after login — not on a public board.
These are the six terms our players ask about most when exploring slots, live tables and crash games on the platform.
RTP is the percentage of total wagers a game is designed to return to players over a very large number of rounds. A 96% RTP means the game pays back 96 for every 100 wagered on average over time — it is not a per-session guarantee. This figure is shown only where the game or provider publishes it.
House edge is the mathematical advantage the game holds over the player, expressed as a percentage of each wager. It is the mirror figure to RTP carries a 4% house edge.
Volatility describes how a slot distributes its payouts. High-volatility slots pay out less frequently but in larger amounts when they do hit. Low-volatility slots produce smaller, more regular wins. This rating is visible in the game info panel for most JDB and Joker slot titles.
A turnover requirement is the total amount you must bet before a credited amount becomes withdrawable. For example, a 10x turnover on a credited amount means placing bets totalling ten times that amount across eligible games before the funds unlock to your wallet.
Jackpot is a slot's largest available prize, triggered by a rare symbol combination or a dedicated feature round. It sits at the top of the game's prize table. The exact trigger condition and prize structure are shown inside the game's rules panel.
A live dealer game streams a real human dealer from a studio to your device in real time. You place bets on your screen; the dealer handles cards, roulette wheels or dice physically. Live Baccarat Turbo, available in our lobby, is one example of this format.
These six terms come up in the sportsbook, payment flow and account verification screens — all distinct from the game-mechanic terms above.
Asian handicap removes the draw outcome by giving one team a fractional goal advantage or disadvantage before kick-off. This leaves only two possible results. It is widely used in Liga 1 and European football markets and is displayed on each match card in the sportsbook section.
Over/under is a bet on whether a specific statistic — most often total goals in a football match — will be higher or lower than a set line. You pick over or under that number; the margin is set by the market, not by the final scoreline of any individual team.
Rollover is the same concept as turnover — the total wagering volume required before a credited balance can be withdrawn. The exact multiplier and eligible game types for any rollover condition are listed in the offer details panel inside your account dashboard after login.
An e-wallet is a digital payment account — DANA, OVO and GoPay are the three e-wallets supported on mahyong138 for Indonesia players. You link your e-wallet number in the payment section of your account, then select it when initiating a deposit or withdrawal transaction.
KYC stands for Know Your Customer — the process of verifying your identity before larger transactions are processed. On this platform, KYC is triggered at certain withdrawal thresholds or account actions. The required documents and steps are shown in your account verification section after login.
Decimal odds express the total return per one unit staked, including your original stake. An odds figure of 2. 50 means a 10,000 stake returns 25,000 total — 15,000 profit plus the original 10,000. This format is the default in most Indonesia sportsbook displays.
Glossary terms become useful the moment you're choosing between two options in the lobby. Suppose you're deciding between a JDB slot and a Joker slot before a short session. The game card shows volatility and, where the provider publishes it, the RTP figure — those two numbers together tell you whether the game suits a shorter session on a limited balance or a longer one with more room to absorb variance. When you move to the live casino section, the Aviator Fast Round screen shows a multiplier curve in real time; understanding that the multiplier is the game's prize mechanism — not a guaranteed outcome — keeps the decision rational.
Before entering a JDB or Joker slot room, tap the info icon on the game card. Volatility and RTP — where published — appear here. These two terms together tell you how the game distributes prizes across a session.
The multiplier in Aviator Fast Round rises in real time and stops when the round ends. The multiplier is the prize coefficient applied to your active stake — not a scheduled payout. Understanding this term prevents misreading the game's mechanic as a fixed return.
Each Liga 1 or European football match card in the sportsbook lists the Asian handicap line and the over/under figure side by side. Both terms are active markets — you choose one or the other, or both, on a single match depending on your read.
Your wallet, transaction history, KYC status and any active turnover requirement are all visible in the dashboard after login. The labels used there match the terms defined in this glossary — so navigating the dashboard becomes straightforward once the vocabulary is clear.
These questions are about how the platform handles the features behind the terms — distinct from the definitions themselves.
RTP is shown inside the game's own information panel, accessible from the game card in the lobby. We display this figure only where the studio — JDB, Joker, Microgaming or PlayStar — makes it available. Not every title publishes an RTP in its rules panel.
After login, open the account dashboard and navigate to the verification section. The page shows the current status of each KYC step and any outstanding document requirements. Complete each step shown there before initiating a transaction that requires verified status.
When an offer with a turnover condition is active, your account dashboard shows the current wagered amount against the required total. This counter updates as eligible bets settle. Check the offer details panel to confirm which game categories count toward the requirement.
Your deposit method — DANA, OVO, GoPay or Bank Transfer — does not affect rollover calculation. Rollover is tracked against bets placed in eligible game categories, not against payment source. Confirm the eligible categories in the offer details panel in your account after login.
Odds formats are displayed directly on each market card in the sportsbook. The option to switch between decimal and other supported formats, where available, appears in your account settings. The current format preference is saved to your account session across devices.
Winnings from a Live Baccarat Turbo round or any other live dealer game are added to your account wallet balance when the round settles. The transaction is recorded in your account history with the game name, round result and amount — visible immediately after the round closes.