The 0.706% Challenge
Railroad! Solitaire
A game of alignment and chain reactions
52 cards are dealt one by one into a single row. Your success depends entirely on the relationship between the 1st and 4th cards from the right end of the row.
Rank match
Same rank — clear four
When the 1st and 4th cards from the right share the same rank — two Kings, two Fives — all four cards in that group are removed from the row.
Suit match
Same suit — clear two
When the 1st and 4th cards share the same suit — both Hearts, both Clubs — the two middle cards are removed. The outer cards remain.
The cascade. Every time cards are removed, the row collapses and new matches can form — triggering chain reactions that clear large sections at once. Win by clearing all 52 cards.
More to play for
The core Railroad game is unchanged. v2 introduced progression, power-ups, and rewards. v2.1 deepens the bonus rounds, adds 18 new achievements, and improves award rates throughout.
Bonus round
Caboose Bonus
Trigger a cascade of three or more and you unlock the Caboose Bonus. Cards from your discards are revealed and you place them into five poker hands: Flush, Straight, Straight Flush, Full House, and Five of a Kind. Complete a hand to spin the reward wheel. Multiple cascades in a game earn additional cards — and at least one is always playable.
Rewards
Power Meter and Reward Wheel
Every discarded card feeds the power meter. Fill it and you spin an infinite reward wheel that grants cosmetics and power-ups. No losing segments. The meter also fills when you complete a caboose poker hand.
Power-ups
Five ways to bend the odds
Joker inserts a wild card into the deck mid-game. Derail removes two cards and sweeps the board for cascades. Meter Boost doubles your meter fill rate. Extra Pick gives you more cards in the bonus round. Switchyard rearranges your endgame.
Progression
Achievements and cosmetics
Thirty-three achievements track everything from your first cascade to the impossibly rare Impossible Flush — and completing them now awards power-ups directly. Unlock card backs and table surfaces through the reward wheel. Achievement progress is visible at a glance on the main menu bar.
What else is in the app
- Simulation-verified win rate — 350+ billion games confirm the 0.706% expected win rate. Every game is numbered and tracked.
- Live probability stats — A real-time histogram shows your score distribution across every game you've played, compared to the expected curve.
- Interactive tutorials — Mac the conductor walks you through every mechanic with step-by-step overlays. Nothing is left unexplained.
- Desktop versions — macOS and Windows builds of the original Railroad! are available for players who prefer a larger screen. Download for macOS or Windows.
Ready to take on 0.706%?
Free on the App Store. Power-ups earned through play. No paywalls.
Railroad! Yard Solitaire
A strategic variant built on the same rules engine. Four sidings, thirteen cards each — you choose which card enters the main line on every turn. The cascade logic you already know, with far more to think about. Rules are published and the game is playable today with any standard deck. No app required.
Read the Official Rules →