Probability Breakdown
Keno draws 10 numbers from 40. The probability of matching exactly K out of your P picks follows the hypergeometric distribution: C(P,K) × C(40-P, 10-K) / C(40, 10). Matching all 10 of 10 picks: ~1 in 8,911,711. The payout table is designed so E[payout] = 0.955 × bet.
House Edge Explained
Keno has a 4.5% house edge (95.5% RTP). This is higher than most Rookie games because Keno payouts are weighted toward rare high-match outcomes. The payout table balances frequent small returns against rare jackpot-level wins while maintaining the target RTP.
What Does This Mean for You?
With an RTP of 95.5%, for every 100 coins you wager on Keno, you can expect to get back approximately 95.5 coins over thousands of rounds. The remaining 4.5% goes to the house.
This is a long-run average. In any single session, your results will vary wildly — that's the variance (volatility: High). Short sessions can see 50%+ swings in either direction. The RTP only converges over thousands of rounds.
Rookie's provably fair system means you can verify these odds yourself. Every round is cryptographically determined before you play, and the math is public. No hidden RNG, no server-side manipulation.