Coin Flip, launched in November 2025, is the simplest game 155.io makes. A purpose-built machine flips a real coin using a precision solenoid, an overhead camera films each flip, and you call heads or tails. One side of the coin shows a US president and the other the American flag.
How Coin Flip works
- Call it: heads or tails.
- Place your bet before the flip.
- Watch the machine flip the coin.
- Result. The face that lands up decides the round, and a correct call pays 1.82x.
The odds
A fair coin is a 50/50 event. If it paid 2x, the house would have no edge. Coin Flip pays 1.82x, which gives an RTP of 90.91% and a house edge of just over 9%. There are no Lightning Rounds or boosts to change that.
That’s a steep price for a coin toss. The appeal is the simplicity and the novelty of a real machine doing the flipping, not the value.