Readers in the Philippines should verify if the operator supports PHP, GCash, or Maya, and check if they hold a valid license from the national regulator, PAGCOR, before playing.
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 Philippine Players Should Check
Before playing the RK89 demo, verify the operator's legitimacy. Check if they accept Philippine Peso (PHP) and local e-wallets like GCash and Maya. Confirm if the brand is licensed by PAGCOR, the national regulator. Look for responsible gambling tools and clear terms.
- Verify PAGCOR licensing status on their website.
- Check if GCash or Maya are supported for future deposits.
- Ensure the demo uses virtual coins, not real money.
- Confirm age restrictions (18+) apply.
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.
Frequently asked questions
Is this an operator site?
This independent RK 89 guide supplies its own free Common Factor Roulette demo. Operator identity, domains, licence, apps, payments, support and commercial game equivalence have not been independently verified. No operator account or commercial link is supplied here.
How is the score calculated?
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.
How are bands priced?
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.
What return is displayed?
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.
Is RK89 licensed in the Philippines?
This guide does not verify RK89's license. Check the operator's site for PAGCOR registration details.
Can I use GCash or Maya on RK89?
Payment methods are not verified here. Check the deposit page to see if GCash or Maya are supported.
Explore the original free Common Factor game and its score bands.
