TH68Independent guide · Virtual play
Learn the wheel · 18+

European Roulette Rules and Terracotta 37 Mechanics

European roulette uses a single zero wheel with 37 pockets. This guide explains the specific mechanics of the Terracotta 37 demo, including odds, payouts, and wallet rules.
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Game Mechanics and Payouts

The wheel features 37 equally likely pockets numbered zero to thirty-six. Red pockets are one, three, five, seven, nine, twelve, fourteen, sixteen, eighteen, nineteen, twenty-one, twenty-three, twenty-five, twenty-seven, thirty, thirty-two, thirty-four, and thirty-six. Zero loses both colour bets and wins a single-number bet only when zero was selected. A winning colour pays two times the stake gross. A matching number pays thirty-five point five times the stake gross. Losing bets return zero. The game uses a custom gross return different from standard European roulette.

Odds, RTP, and House Edge

Colour bets have a win probability of approximately forty-eight point six percent and an expected RTP of ninety-seven point three percent. Single number bets have a win probability of approximately two point seven percent. The expected RTP for single numbers is ninety-five point nine percent. The measured RTP aligns closely with these expectations. The house edge varies by bet type but remains consistent with the game's mathematical design.

Wallet Rules and Settlement

A whole stake is deducted once at the start. After nine hundred milliseconds, winning bets pay out. Gross returns include the stake. Any fractional carry is separate from credited whole coins. Manual restoration is available only when the balance falls below one coin while idle. This resets the balance to one thousand coins. Unfinished rounds do not resume on reload; coins are lost.

Controls and Demo Features

Stakes are one, five, ten, or twenty-five coins, with one as the default. Modes include Red, Black, or Single number. The number selector is enabled only for single number bets. The spin button is disabled while spinning. Session counters reset on reload. The demo uses browser storage for wallet data without an account. No cash value is attached to the virtual coins.

Frequently asked questions

What is the difference between gross and net profit?

Gross return includes the original stake. Net profit equals the gross return minus the stake. The demo displays gross amounts upon winning.

How does the fractional carry work?

Fractional carry is separately displayed as zero or zero point five coins. The floor of gross plus carry credits whole coins. The remainder stays separate until manual refill clears it.

What happens if I reload during a spin?

Reloading loses the unresolved round with no refund. The debited coins are saved, but the outcome is not resumed. You must start a new spin after reload.