Buy properties, charge rent, and bankrupt your rivals. A game ends the moment only one solvent player is left — or when the round cap is hit, in which case the richest player by net worth wins. opolyx is free-to-play; in-game money has no cash value.

Every game runs on the same 40-square board and the same rules. A mode just tunes the economy and a few toggles. Classic is the full-length game; Speed is faster and adds a third die plus uneven building and a mortgage timer; Team plays Classic's economy with the table split into two allied sides.

Team mode splits the table into two even sides — 2×2 with four players, 3×3 with six — playing on Classic's economy. You pick it when you create the room, and the seat count snaps to four or six so the sides stay balanced.

• Allies never pay each other rent: landing on your teammate's street costs you nothing.
• Allies trade without the fairness rule, so a teammate can hand you a street or a pile of cash outright.
• Everything else — building, mortgages, auctions, jail, the payment pause — behaves exactly as in Classic.
• You win together: the last team with a solvent player takes the game, and at the round cap it is the team with the larger combined net worth.

The board is 40 squares in a loop. You always start on Start (square 0) and move clockwise; passing Start pays a 2000 salary, and stopping exactly on it pays that salary plus a 1000 landing bonus.

• 28 properties in 10 groups: 8 colour-street groups, 4 stations (cars), and 2 utilities. Street prices run from 600 up to 4000.
• Four corners: Start (0), Jail / Just visiting (10), Jackpot (20), and Go to jail (30).
• Two tax squares — Income tax (2000) and Luxury tax (1000) — paid to the bank.
• Six Chance squares draw from a fixed 16-card deck (the deck cycles in order).
• Mortgage value is half the list price; buying a mortgage back costs that half plus 10%.

Create a game from the lobby (pick Classic, Speed or Team and the number of seats), or join one that is waiting. A game needs 2–6 players — Team snaps that to 4 or 6 so the sides are even — and starts when the creator presses Start.

• Short of humans? Add bots — they play a full game on their own.
• Every mode starts each player with 15,000; Speed simply spends it faster.
• The first player is chosen at random, not always the creator.

On your turn you roll two dice and move that many squares, then resolve whatever you land on. Your turn then ends automatically — there is no separate ‘end turn’ button.

• Roll a double and you move, resolve, then roll again.
• Three doubles in a row sends you straight to jail (you do not move on the third).
• Passing Start pays 2000.
• If you can build or mortgage, you may do so before or after rolling, while it is your turn.

What happens depends on the square you finish on:

• Unowned property → buy it at the list price, or decline (it goes to auction).
• A rival’s property → pay rent (unless it is mortgaged, which charges nothing).
• Your own property or Just visiting → nothing happens. Start → the salary plus the landing bonus.
• A tax square → pay the bank. Go to jail → straight to jail. Jackpot → an optional dice bet.
• A Chance square → draw the next card and apply it.

Land on an unowned property and you may buy it for its list price. Buy it and it is yours, unmortgaged, with no buildings. Decline and it is auctioned to everyone — so a property is never simply skipped.

When a property is declined it goes to a turn-based auction: bidding moves around the table in seat order, starting with the player after the one who declined — the decliner bids last.

• Bidding opens at the list price and rises in steps of 100 — on your turn you bid the minimum or pass; passing is final.
• You have 10 seconds per turn; running out of time — or being unable to afford the minimum — passes you automatically.
• When everyone but the leader has passed, the leader buys at their bid. If nobody bids, the property stays unowned.

The third corner, square 20, is a dice bet rather than a rest stop. Land on it and you are offered a flat 1000 stake: pick one, two or three numbers from 1 to 6, and a single die is rolled.

• One number pays 6000, two numbers pay 3000, three numbers pay 2000.
• Every size is exactly break-even — over many spins the square neither gives nor takes.
• Declining costs nothing, and you cannot play at all with less than the stake in cash.

Bots always decline, so the square only ever spends a human player's money.

Rent is paid to the owner of the property you land on. Mortgaged properties charge nothing — and in Team mode an ally's property charges you nothing either.

• Streets: base rent rises with buildings. Owning a whole colour group with no buildings doubles the base rent.
• Stations pay by how many of the four the owner holds: 250 / 500 / 1000 / 2000.
• Utilities charge your dice roll × 40 (one owned) or × 100 (both owned).
• A collectible card for that exact field raises its owner's rent on it — a few per cent for a common card, up to a third more for a legendary one. Only the best card counts, and the increase is capped.

Cards are the one thing you own outside a match that changes what happens inside one. Each card belongs to a specific field, and holding it raises the rent you charge when someone lands there.

• The boost depends on rarity — a few per cent for a common card, up to a third more for a legendary one.
• Only your best card for a field counts: boosts never stack, and the total increase is capped.
• Cards drop when you reach certain levels, and winning a game drops one as well.

Nothing else about a card touches the rules: they change no prices, no dice and no turn order.

To stop endless games, rent is taxed once a game runs long: a share is withheld from the owner and rises with the round, up to 99%. In Classic the tax starts at round 100 and maxes at round 200; in Speed it starts at round 40 and maxes at round 100. Taxes, Chance payments, and jail bail are never rent-taxed.

Own every property in a colour group and you can build on them to raise rent (up to 5 buildings each).

• Classic builds evenly — raise the lowest property in the group first, at most one step per property per turn.
• Speed allows uneven building — any property in the group, any number per turn.
• You cannot build while any property in the group is mortgaged.

Need cash? Mortgage a property to the bank for half its list price; it then charges no rent. Buy it back for that half plus 10%. You must sell a group’s buildings before mortgaging any of its properties.

In Speed only, a mortgage is on a clock: if you don’t buy it back within 10 rounds the property is released to the bank and anyone can buy it again. You get a reminder on your turn each round. In Classic a mortgage never expires.

When you owe rent, tax, a Chance charge, or jail bail, the game pauses on a ‘Pay’ button instead of deducting silently.

• Pay from cash when you can.
• Short on cash? Sell buildings or mortgage properties right there to raise it, then pay.
• If you run out of time on the pause, the game auto-raises the cash for you, or bankrupts you if it cannot.

Bankruptcy is only offered when even selling and mortgaging everything still can’t cover what you owe.

• Everything you own is liquidated to the bank and the proceeds pay the creditor(s).
• With several creditors the money is split in proportion to what is owed.
• Your properties are freed for others to buy, and you are out of the game.

You go to jail on a third double, by landing on Go to jail, or from a Chance card. Jail does not cost anything to sit in, and there is no get-out-of-jail card in opolyx.

• Roll a double to get out and move that many squares — but you do not get an extra roll.
• Or pay 500 bail at the start of your turn to leave and roll normally.
• Fail three times and you must pay the 500 bail through the payment pause, then you are freed.

The 16-card Chance deck is drawn in a fixed order and cycles. Cards do one of:

• Collect from the bank (1000–2000) or pay the bank (500–2500, via the payment pause).
• Collect a small amount from every opponent, or pay every opponent.
• Pay a repair bill per building you own.
• Move you — to Start, to a named square, back a few squares, or to the nearest station/utility (collecting the Start bonus if you pass it).
• Send you to jail.

Trade cash and properties with another player to break a monopoly deadlock or raise cash.

• Propose on your turn (before rolling), or while you are paused on a debt to raise cash.
• Each side may mix cash and properties, but not mortgaged or built properties.
• Fairness rule: the smaller side must be worth at least 50% of the larger side — no gifting. Teammates are exempt and may hand each other anything.
• Offers have a deadline; bots accept deals that don’t lose them value.

From round 7 in Speed, a third die rolls with the two white dice (never while in jail):

• A number (1–3) is added to your move.
• A Bus lets you choose to move the dice sum or just one die.
• An X moves you normally, then jumps you at turn end to the nearest free property (or a rival’s, to pay rent). Rolling the same number on all three dice (a triple) teleports you anywhere and grants a re-roll — and never counts as a jail double.

Every turn has a time limit so a game never stalls (about 75s in Classic, 45s in Speed; a payment pause always allows at least 75s).

• Run out of time and your turn is skipped (or auto-played for forced choices).
• Miss three turns in a row and you are automatically surrendered.
• Any action you take resets the missed-turn counter.

A game ends in one of two ways:

• Last player standing — everyone else has gone bankrupt or surrendered.
• The round cap is reached (500 in Classic and Team, 300 in Speed) — the richest player by net worth wins, ties broken by seat. In Team mode it is the richest team by combined net worth.
• Every seat earns XP from a finished game, scaled by where you placed, the complete colour groups you still held and whether you survived; a win also drops a collectible card. Games that end in the first few rounds pay nothing.

Edge cases the engine handles for you:

• If a creditor is knocked out while you’re mid-payment, their share goes to the bank instead.
• A mortgaged property always charges zero rent.
• Once you’re eliminated or surrender, you can immediately start or join another game while the others finish.
• You can’t mortgage a property until the whole group’s buildings are sold.
• A Speed ‘X’ only targets properties, never a Chance or corner square; a speed triple is never treated as a jail double.
• You can only be in one unfinished game at a time.

A few things the rest of this guide has not mentioned, none of them required to play:

• Sound effects for rolls, purchases, auctions and the endgame, with a mute button in the top bar that your device remembers.
• Chat at the table and in the lobby, with stickers. The action log beside it is condensed, so an ordinary roll reads as one line instead of five.
• Bots with their own persistent names and playing styles, who fill an open room so nobody sits waiting alone.
• Daily and weekly missions, a weekly leaderboard, and one-way following to keep an eye on the players you like.
• opolyx installs as an app straight from the browser, and plays on a phone in the same room as a desktop.
• Ten languages, including right-to-left Arabic.