GAME GUIDE · HOLD & WIN
How Hold & Win Works: 3×3 Grid, Bonus Trigger and Exact RTP
Vault Hold & Win is a 3×3 Local Practice. Nine visible base cells are generated independently from fixed symbol weights. Six or more Coins trigger the Hold & Win Bonus, locking existing Coins into a three-respin mechanic.
- Runtime
- Practice default / Staged server
- Grid
- 3 × 3
- Target RTP
- 96.00%
- Exact model
- 95.8366%
Base game and Bonus
- Each base cell uses a weighted symbol table totaling 3,148. Coin weight is 788, giving a per-cell Coin probability of about 25.0318%.
- The Base Game has five paylines. Three matching non-Coin symbols on a line add the configured line multiplier.
- Six or more Coins among the nine cells trigger the Bonus. Initial Coins are held, and each empty cell has a 5% chance to land a new Coin on each respin.
- The Bonus starts with three respins. Any respin that lands at least one new Coin resets the counter to three. Filling all nine cells adds the 500× GRAND.
Exact model rather than one headline RTP
With p=788/3148≈25.0318%, the six-plus Coin trigger is Binomial(9,p): P(K≥6)=Σ(k=6→9)C(9,k)p^k(1−p)^(9−k)≈1.0061%. Current exactBaseRtp()≈45.6889% and exactFeatureRtp()≈50.1477%, so exactTotalRtp()≈95.8366%. HNW_TARGET_RTP=96% is a design target and should not be presented as identical to the current exact model.
| Base RTP | Exact | 45.6889% |
| Feature RTP | Exact | 50.1477% |
| Total RTP | Exact | 95.8366% |
| 6+ Coin trigger | Exact | 1.0061% |
Round truth and presentation
Hold & Win establishes the complete round result before animation. Mode availability follows the current runtime configuration shown above; Practice status and server capability are disclosed separately.
Frequently asked questions
Why does the page mention both 96% and 95.8366%?
96% is the engine target constant. Exact calculation from the current weights, paytable, bonus process and jackpots produces about 95.8366%, so Target and Exact should be labeled separately.
How is the Bonus trigger rate calculated?
All nine base cells use the same Coin probability p=788/3148 independently, so the probability of at least six Coins is a binomial tail.
Why can the Bonus last longer than three respins?
Any respin landing at least one new Coin resets the remaining count to three; only a respin with no new Coin consumes one.
Can animation change the final result?
No. The engine creates complete round truth first, and reel movement, Coin landing and jackpot animation reveal it afterward.