The rules
Each player has tokens waiting in a yard. Roll a six to bring one out onto your coloured entry square, then move clockwise around the 52-square track. After a full lap you turn off into your own colour column and walk five squares to the centre — and that last step needs an exact count, so a token one square from home sits there until you roll a one.
Land on a single opponent token and it goes back to its yard, which is the biggest swing in the game and earns you another roll. So does a six, but three sixes in a row forfeits the turn. The eight star squares are safe: nothing can be captured there. Two of your own tokens on the same square form a block that opponents can neither land on nor move past.
Why the dice are the whole point
Look at the reviews of any Ludo app and the same accusation appears thousands of times: the dice are rigged, the app decides who wins, the sixes arrive when the computer needs them. The usual reply is that the random number generator is certified — which asks the player to take it on faith, and faith is exactly what is missing.
This game does not ask. Before you play we publish a SHA-256 hash of a secret seed; you supply a client seed of your own. Each roll is computed from both plus its roll number, so no die can be altered after seeing your position. At the end we reveal the seed. Check it against the hash you were given, then recompute every roll on the verification page. If we had cheated, the numbers would not line up — and you would be able to prove it.
A shorter game, because we measured it
Classic Ludo is long. Our own simulation of four-player games averages roughly 640 dice rolls, which is a genuine half hour. That is the game as designed, and it is fine when everyone is around a table — less so in a browser tab. The Quick game gives each player two tokens instead of four and averages about 180 rolls, keeping every other rule intact.