Royal Game of Ur on Arcadia
The Royal Game of Ur is one of the oldest known board games on Earth — playable boards have been excavated from royal tombs in ancient Mesopotamia dating to 2600 BC. It's a fast, tactical race game using four tetrahedral dice and a 20-square board with five lucky rosettes. Race all seven of your pieces around the sacred path and bear them off before your opponent does.
How to Play
- Pick your side — Shell (white, plays first) or Lapis (blue).
- Roll the four tetrahedral dice. Each die has two marked corners and two blank — count the marked corners. Total ranges from 0 to 4.
- Move a piece by exactly the rolled amount, either bringing a new piece onto the board or advancing an existing one along your path.
- Land on a rosette to gain safety from capture and an extra roll.
- Capture by landing on an opponent's piece on the shared middle row — they go back to start. Pieces on rosettes cannot be captured.
- Bear pieces off by rolling the exact amount to leave the final square.
- First to bear off all seven pieces wins.
Core Rules
- Seven pieces per player, each must complete the full 14-square path
- Four binary tetrahedral dice — each shows 0 or 1, total roll is 0–4
- Roll of 0 passes the turn automatically
- Five rosettes give safety + an extra roll
- Capturing opponent pieces on shared squares (middle row) sends them back to start
- Cannot capture a piece resting on a rosette
- Cannot land on your own piece (own pieces block movement)
- Exact roll required to bear off — no overshooting
- No legal moves? Turn passes automatically
Strategy
- Hunt the rosettes. Especially the central rosette on the shared row — landing there is safe AND grants another roll.
- Stack threats on the shared row. A piece in the middle that can capture forces your opponent to play defensively.
- Don't park on captureable squares. If your piece is on the shared middle and your opponent has a piece 1–4 squares behind it, you're at risk.
- Probability matters: rolling 2 happens 6/16 (37.5%), rolling 0 or 4 each happen only 1/16. Plan for the most likely roll.
- Race to bear off. Once a piece reaches the second private row, it's safe — push hard to clear the board.
Practical Tips
- The four dice each contribute 0 or 1, so totals follow a binomial distribution: 0 (6.25%), 1 (25%), 2 (37.5%), 3 (25%), 4 (6.25%).
- Three difficulty levels — Easy (sloppy), Medium (balanced), Hard (defensive). Start on Medium.
- Highlighted squares show your legal moves after rolling. Click any highlighted destination — or the piece itself — to move.
- Red glow on a destination square means your move will capture an opponent piece.
- Gold glow marks the last move so you can track the action.
FAQ
How old is the Royal Game of Ur?
The earliest playable boards date to roughly 2600 BC, found in the Royal Cemetery at Ur (modern-day Iraq) by Sir Leonard Woolley in the 1920s. The rules survived on a Babylonian clay tablet from 177 BC — almost 2,500 years after the boards were buried.
How does the dice work?
You roll four tetrahedral (4-sided) dice. Each die has two marked corners and two blank — count the marked corners that land facing up. Each die shows 0 or 1, so the total is between 0 and 4. Probability: 0 (6.25%), 1 (25%), 2 (37.5%), 3 (25%), 4 (6.25%).
What happens on a rosette?
The five rosette squares are sacred. A piece resting on a rosette is safe from capture, and the player who landed there gets an extra roll that turn. Stacking rosette landings is a common path to victory.
Can I play Royal Game of Ur online for free?
Yes — Arcadia hosts a free single-player version against an AI opponent. Three difficulty levels, no signup required, your stats save locally.
What if I roll a zero?
A zero roll passes your turn automatically — none of your dice landed marked-side up, so you can't move. The same applies if you have no legal moves with the rolled amount.
Ready to play Royal Game of Ur?
Launch the free demo, learn the flow, and practice tactics before higher stakes.
