Double by 100HP Gaming

The aim of Double is to guess the colour of the card the strip stops on. Here's a step-by-step guide to playing Double.

Step 1: Choose a chip

Pick a chip worth $0.10, $0.50, $1, $5, $25 or $150.

Step 2: Place your bets

While the timer counts down, tap Red, Green or Blue to place chips. You can bet on green alongside red or blue, but not on red and blue together. Your total appears in the Total Bet field, up to $150.

Step 3: Adjust your bet (optional)

Use x2 to double your chips, Undo to take back the last chip (hold it to clear them all) or Rebet to repeat your last bet.

Step 4: Watch the spin

When betting closes, the strip spins and stops on one card. If it's your colour, you win your bet times its multiplier.

Double Paytable

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The default theoretical Return to Player (RTP) is 93.33% and the maximum multiplier is ×14, for a correct bet on green. A single round pays out no more than $10,000.

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Below are the key game features of Double:

• Three colours: Red and blue pay ×2, and green pays ×14.
• Shared rounds: Every player bets on the same spin, with a player count shown on each card.
• Chips: Six chip values from $0.10 to $150, with x2, Undo and Rebet buttons.
• Result history: A bar at the top shows the latest results.
• Live, My and Top: Follow live bets, your own history and the biggest wins.
• In-game chat: Talk to the other players in the round.
• Provably Fair: Each result comes from a hash chain published in advance and the hash of a Bitcoin block announced before it was mined.

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Double has a responsive design that works on mobile, tablet and desktop. No download needed, simply launch the game from your browser and play.

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Red, blue or green. Double by 100HP Gaming doesn't ask much more of you than that, and a round is over in a few seconds. The ×14 green is the only real long shot, landing about once every 15 spins, which makes it a natural side bet next to a colour.

The weak spot is the maths. At 93.33%, the RTP sits more than four points below the 98% that most of 100HP's instant games offer, and it's the same 6.67% edge whichever colour you pick. There's no autoplay either, so each round means placing your chips again or pressing Rebet.

What it does well is the shared table. Seeing the player counts on each card, the chat and the live bets roll in gives it more atmosphere than a solo spinner, and the Bitcoin-backed fairness check is a nice touch. Go in for quick, social rounds rather than value.