RK89: Roulette Rules

Two draws and their greatest common divisor

One paid round draws two independent uniform pockets numbered 0–12. Score is their greatest common divisor, with gcd(0,0)=0. Choose score band 0–4, 5–8 or 9–12 before spinning. All 169 ordered pairs are equally likely.

What Malaysian Players Should Check

For readers in Malaysia, understanding the local context is crucial when engaging with online gaming platforms like RK89. While gambling is tightly restricted by national law, many Malaysians access international or local online gaming sites. Since RK89 is an independent demo site, you must verify if the underlying operator holds a valid licence to offer such games to Malaysian residents.

When checking payment methods, look for options familiar to locals, such as Touch 'n Go eWallet and DuitNow. These are common for topping up virtual coin balances in local apps. However, do not assume RK89 supports them without checking the operator's official payment page. Also, confirm the currency used; while MYR (Malaysian ringgit) is standard, some international operators may default to USD or EUR. Always check the terms for currency conversion fees.

• Verify the operator's licence on their official site, not here.
• Check if Touch 'n Go or DuitNow are supported for virtual coin refills.
• Confirm the base currency is MYR to avoid exchange fees.
• Ensure you are of legal age (18+) to play.

For safety, use a strong password and check if the site uses HTTPS. Remember, this is a demo; no real winnings are guaranteed.

Exact169-pair enumeration

There are 141 winning ordered pairs for scores 0–4, 16 for 5–8 and 12 for 9–12. For example, draws 6 and 9 have gcd 3, draws 0 and 8 score 8, and draws 0 and 0 score 0. Multipliers use these exact counts, not the number of score labels.

Displayed hit probability and total return

The hit probabilities are 141/169,16/169 and 12/169. Total-return multipliers are 1.150638298,10.14 and 13.52 respectively. A hit returns stake×0.96×169 divided by the selected winning-pair count, including stake; a miss returns zero.

Expected return and variance

Exact expected return is 96% in every band: hit probability multiplied by the total-return multiplier is 0.96. Bands change hit frequency and variance, not expectation. A 96% expectation is not a promise of a single spin or a short session. This demo does not certify an external operator or reproduce its games.

One stake and one settlement

Select a band and virtual stake before starting. One stake is deducted, and both independent draws settle together. Settings, start and refill are locked during the round. A matching GCD score pays the displayed total return; any other score returns zero. There is no mid-round cash-out or additional stake for the second draw.

Local wallet and refill

Settled balance and fractional payout carry persist in localStorage. Reloading during a round ends it without refunding its deducted stake. Outside a round, refill sets 1000 coins when balance is below the smallest stake; it does not add 1000 or erase fractional carry. Band and stake return to defaults on reload.