Bitcoin, served on clay
Welcome to the only court where the ball is optic yellow, the lines are bright white and the 21 million cap never gets a line call. Rally against the CPU, learn to keep score like the chair umpire, then track a whole match point by point. No signup, no downloads, no waiting for the court to dry.
Tap the ball for another bounce run.
Love all. Home to serve.
Deuce court
A top-down clay court, a yellow ball with real spin on it, and a CPU opponent who never gets tired but does get greedy. Slide your racket, sweep across the ball to bend it, and go bold when you feel lucky. Keyboard, mouse and touch all work.
Prefer calm? Turn-based mode lets you call every shot with a button. No motion needed.
Serve it upAd court
Love, fifteen, thirty, forty: tennis counts like nothing else on earth. The primer walks you through points, games, sets, deuce, advantage and the tiebreak, in plain sentences with no hand waving.
Then use the point tracker. Tap a point, watch the scoreboard flip, hit undo when your thumb slips. It keeps a full log you can print or copy.
Read the rulesShort, certain and not for sale. No prices, no predictions, no tips. Just the rules of the game, the way the court has lines.
Bitcoin's rules cap the supply at 21 million coins. Fixed court size. Nobody gets to repaint the lines mid-match.
The network aims for a new block about every ten minutes. It is a target, not a stopwatch: some blocks arrive fast, some take their sweet time.
Every 210,000 blocks the reward for adding a block is cut in half. At target pace that is roughly every four years. Same game, smaller prize.
Proof of work leans on SHA-256: laborious to produce, instant to check. The rally takes forever. The call takes a blink.
Bitcoin tracks unspent transaction outputs. You spend whole ones and collect change. You cannot slice a ball in half to pay for a towel.
One satoshi, a sat, is a hundred-millionth of a bitcoin. Sat Rally is named for that tiny, brilliant unit.
Practice court
Eight original training drills, each one borrowing a Bitcoin idea and turning it into reps: a capped ball basket, a ten-minute block, a halving challenge and more. Filter them, build a session, print it, take it to a real court.
Open the drill bagChair umpire
Spotted a bug? Disagree with a call? Want a drill added? Write a note and the contact page builds an email draft in your own mail app. We never see it until you hit send.
Call the umpireThe Bitcoin whitepaper is published: the first draft of how the whole game works.
The genesis block opens the chain. Every block since links back to it, like every rally links back to a first serve.
Line judge's note. Sat Rally is independent and for fun. It is not affiliated with any tennis tour, tournament, player, club or Bitcoin company, and it names none. Nothing here is investment advice or a prediction of any kind.