# Mechanics
DeSui Coin Filp is a double or nothing smart contract with 50/50 odds of heads or tails.
A user bets on heads or tails. If they guess correctly, they win and the smart contract loses. A loss triggers the smart contract to send the user double their initial wager (minus [fees](/sui-coin-flip/fees.md)):
`User: bets 0.5 SUI on HEADS.`
`Smart contract: HEADS ✅`
`-> Smart Contract sends 1 SUI to user wallet`
If a user guesses incorrectly, the user receives nothing and the smart contract sends the wager into the house balance.
`User: bets 0.5 SUI on TAILS.`
`Smart contract: HEADS ❌`
`-> Smart Contract sends 0.5 SUI to house wallet`
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