Bowling: how it plays, odds and payouts

Bowling is a one-frame game: you roll a ball down the lane, and if pins are left you roll a second ball at whatever is standing. The pins you end up knocking down set the pay. A strike is the top prize at 4x, and it is the gentlest game in the lobby, with frequent small returns and a low ceiling.

How a round works

1. Set your bet and roll. The first ball knocks down anywhere from 0 to 10 pins according to a fixed table.
2. If all ten fell, that is a strike and the frame pays 4x.
3. Otherwise a second ball is rolled at the pins left. Each standing pin falls with a 50% chance.
4. If the second ball clears them all, it is a spare and pays 1.6x. If not, the total pins down decide the pay: 9 pins 0.8x, 8 pins 0.4x, 7 or fewer nothing.

Both balls are decided as soon as you tap. The pin action is the reveal.

Odds and payouts

So 79.3% of frames pay something and 27.4% pay more than the bet. The most common single result is a 9-pin frame, which pays 0.8x. A strike on the first ball happens 8.1% of the time, and clean-ups by the second ball add another 19.3% as spares.

Worked example

Say the first ball knocks down 7 pins, leaving 3 standing. The second ball gives each of those 3 pins a 50% chance of falling, so there are four outcomes:

The average of those outcomes is 0.125 x 1.6 + 0.375 x 0.8 + 0.375 x 0.4 = 0.65x. So a first ball that leaves 3 pins is worth 0.65x on average, below the 0.97x average of the whole game. A first ball that leaves 1 pin is worth more: that pin falls half the time (spare, 1.6x) and otherwise leaves 9 pins (0.8x), an average of 1.2x.

Max win and limits

The top of the game is a strike for 4x. The game-wide limits (50,000x the bet, 250,000,000 coins per round) are nowhere near. That small top prize is why volatility is low: you are unlikely to see any single frame change your session either way, and wins and losses come in small steps.

What matters and what does not

• Throw timing and aim: neither matters. The frame is fixed before the ball rolls.
• The score you saw earlier: frames are independent. A run of gutter frames does not make a strike more likely.
• Bet size: scales the coin amounts only.

Return to player is 96.97% over the long run. If you want a game that rarely changes your balance by much, this is the closest thing to it; if you want long dry stretches broken by spikes, look at Pinball. Both are explained in terms of spread in volatility explained.

How it differs from other instant games

Pinball pays up to 200x but drains 54% of the time. Bowling nearly always gives something back and never pays more than 4x. Coin Pusher has a similar steady feel with a higher top prize.

Play with limits

Coins are virtual, have no cash value and cannot be withdrawn or exchanged for prizes. For adults (18+), for entertainment. Set a time limit before you play; see playing safely in Cashout Arcade.