Rules

Who can play

• Free to play, no pay-to-win. No purchase, no crypto holding, no transaction required: every player has the same chance of winning.
• 18 years old or older.
• One account per person, one email and one wallet per account. Multiple accounts lead to disqualification of all linked accounts.
• No bots or scripts. Picks must be made by a person. Automated play leads to exclusion. We use dedicated technology and close monitoring against bots and multiple accounts.
• Exclusion during a tournament: a player excluded while a tournament is running (for example after breaking these rules) makes no pick from the next round on and is out at the next round played, whatever lives, points or streak they have. This is shown in the public pick files ("excluded"). An excluded player can never win, never comes back with the Respawn twist, and their shield (Shield twist) has no effect.

How a tournament runs

• Check-in opens three hours before the announced time and closes at that time, unless the tournament page says otherwise. The first round starts 30 seconds later. Only checked-in players take part. Your display name (pseudonym or shortened wallet) is fixed at check-in. You can cancel your check-in on the tournament page as long as check-in is open, and check in again later. A tournament with fewer than 2 checked-in players is cancelled: nothing counts, and any prize rolls over to a later tournament.
• Each round is announced 3 seconds in advance (picks are not accepted during this countdown), then every player still in picks heads or tails (in a Twin Toss tournament, for each of the two coins) within the round's time (between 5 and 30 seconds, shown on the tournament page). You can change your mind until the end; a pick arriving up to 1 second late is still accepted.
• No pick in time (absent, disconnected, late): a side is picked automatically for you at random by a public formula, and shown on your screen, so you can take part even if you cannot watch live. In a Twin Toss tournament, each coin is handled on its own: a coin you don't pick gets its own random side. Tournaments with the No Auto-Pick twist are the exception: see that twist below.
• One common result is drawn for everyone (one for each coin in a Twin Toss tournament). In Sudden Death and Extra Lives, players on the other side lose a life, and a player with no life left is out (in a Heads Up duel, only the player who lost the flip loses a life, as described below). In Sudden Death, that means the wrong side is out. In a Shield tournament, a player on the other side who raised a shield loses nothing. Points Race, Hot Streak and Diamond Hands have no lives: see their own rules below.

Modes

• Five modes, shown on each tournament page: Sudden Death, where every player has one life, Extra Lives, where every player starts with 2 to 5 lives (shown as "Extra Lives ×3"), Points Race, played over 5, 10, 15 or 20 points rounds (shown as "Points Race · 20 rounds"), Hot Streak, where the first player to be right 3, 5, 7, 10 or 15 times in a row wins (shown as "Hot Streak · 7 in a row"), and Diamond Hands, played over 10, 15, 20 or 25 race rounds, where the most diamonds banked wins (shown as "Diamond Hands · 10 rounds"). A mode can come with twists, also shown on the tournament page, in this order: Heads Up, Twin Toss, Respawn, Shield and No Auto-Pick (each one is described below).
• Points Race: nobody is out during the points rounds. Every player who called the coin right scores 1 point, the others score nothing. Every points round counts, even if everyone is wrong (only a round cancelled for a technical incident is replayed, under the same number).
  • After the last points round, only the players with the best score stay in: if there is just one, they win; otherwise they play a Sudden Death final among themselves, under the usual rules (one life, void round if everyone is wrong).
  • Final standings: the winner, then the finalists in the order they went out, then the other players by score (equal scores share a place).
  • Points Race cannot be combined with the Heads Up, Twin Toss, Respawn or Shield twists.
• Hot Streak: the first player to be right the number of times in a row shown on the tournament (3, 5, 7, 10 or 15) wins. Nobody is out during the race. Every player who called the coin right adds 1 to their streak; a wrong call sends it back to 0. Every race round counts, even if everyone is wrong (only a round cancelled for a technical incident is replayed, under the same number).
  • The race stops as soon as at least one player reaches the target: if there is just one, they win; if several reach it in the same round, they play a Sudden Death final among themselves, under the usual rules, and all the other players are out.
  • The race also has a maximum number of rounds, shown on the tournament (20, 30, 40 or 50): if nobody has reached the target by then, only the players with the longest streak of the race stay in, and play the final if there are several.
  • Final standings: the winner, then the finalists in the order they went out, then the other players by their longest streak of the race (equal streaks share a place).
  • Hot Streak cannot be combined with the Heads Up, Twin Toss or Respawn twists.
• Diamond Hands: played over the number of race rounds shown on the tournament (10, 15, 20 or 25). Nobody is out during the race, and every race round counts, even if everyone is wrong (only a round cancelled for a technical incident is replayed, under the same number). Diamonds are only this tournament's score: every player starts from 0.
  • Every right call in a row grows the diamonds in your hand: 10 after one right call, 30 after two, 75 after three, 150 after four, then twice as many after each further right call. A wrong call loses what is in your hand.
  • Until picks close, a player can hold the Bank button (held like the Shield button) to bank what is in their hand: banked diamonds are safe for good. Bank is free: the player still plays the round, and their next right call starts a new hand, at 10. Bank does nothing with an empty hand, and Bank and a shield cannot both be used in the same round. Banks are sealed with the picks before the draw and published in the same files ("bank"), so every bank can be checked.
  • When a side is picked automatically for a player, what is in their hand is banked first. After the last race round, what is left in every hand is banked automatically.
  • Then only the players with the most diamonds banked stay in: if there is just one, they win; otherwise they play a Sudden Death final among themselves, under the usual rules, with no Bank.
  • Final standings: the winner, then the finalists in the order they went out, then the other players by diamonds banked (equal totals share a place).
  • Diamond Hands cannot be combined with the Heads Up, Twin Toss or Respawn twists.

Twists

• The Heads Up twist (with Sudden Death or Extra Lives, shown as "Sudden Death · Heads Up" or "Extra Lives ×3 · Heads Up lives refilled") turns each round into 1 vs 1 duels. Before picks open, the players still in are paired at random by a public formula, and the pairs are published. Your opponent's pick stays hidden until picks close.
  • Different sides: the player who called the coin right wins the flip, the other loses a life. In Sudden Death, that settles the duel. In Extra Lives, the same two players keep flipping until one of them has no life left: that player is out and the other wins the duel. Depending on the tournament (shown in its waiting room), the lives you have left carry over to the next round, or every player still in gets all their lives back at the start of each round.
  • Same side: the flip is a draw. Only the duels still going are flipped again, with up to 10 seconds to pick, while the other players wait. After 10 draws in a duel (they add up over the whole duel), the sides are assigned by a public formula for every remaining flip of that duel, so each of them has a winner.
  • With an odd number of players, one player, chosen by the same formula, goes through without playing and loses no life.
  • With No Auto-Pick, a player with no pick loses the flip, unless neither player picked (a draw).
  • The void round rule below does not apply to Heads Up tournaments. The Heads Up twist cannot be combined with Points Race, Hot Streak, Diamond Hands, Twin Toss, Respawn or Shield.
• The Twin Toss twist (with Sudden Death or Extra Lives, shown as "Sudden Death · Twin Toss" or "Extra Lives ×3 · Twin Toss"): in every round, two coins fall at the same time, both drawn from the same public draw. You pick heads or tails for each coin (coin 1 on the left, coin 2 on the right), and you can change either pick until the end.
  • Each wrong coin costs a life: right on both coins, you lose nothing; right on one, you lose one life; right on none, you lose two. A player with no life left is out: in Sudden Death you need both coins right to stay in, and on your last life one wrong coin is enough to go out.
  • The Twin Toss twist cannot be combined with Points Race, Hot Streak, Diamond Hands, Heads Up, Respawn or Shield.
• The Respawn twist (with Sudden Death or Extra Lives, shown as "Sudden Death · Respawn 2 in a row" or "Extra Lives ×3 · Respawn 2 in a row"): a player who is out becomes a ghost and can come back. The tournament shows how many right calls in a row bring a ghost back (1, 2 or 3, shown as "Respawn 2 in a row", or "Respawn after 1 right call") and the last round when it is possible (round 5, 10 or 15).
  • From the round after their elimination, ghosts pick during the normal round, on the same coin, at the same time as the players still in. A ghost who is right that many rounds in a row comes back in the game for the next round, with 1 life (also in Extra Lives).
  • A wrong pick, or no pick, sends the ghost's streak back to 0: ghosts never get a side picked for them, so only players who stay in front of the screen can come back. Void and cancelled rounds change no streak.
  • A comeback is possible only if its last right call comes at the last round shown at the latest (void and cancelled rounds are not counted in round numbers); after that, being out is final, and playing as a ghost is just for fun.
  • There is no limit on comebacks: a player who comes back and is out again becomes a ghost again, with a streak starting from 0.
  • Ghost picks that can bring a player back are sealed with all the other picks before the draw and published in the same files, so every comeback can be checked.
  • The Respawn twist cannot be combined with Points Race, Hot Streak, Diamond Hands, Heads Up, Twin Toss or Shield.
• The Shield twist (with Sudden Death, Extra Lives, Hot Streak or Diamond Hands, shown as "Sudden Death · Shield ×2", "Extra Lives ×3 · Shield ×2", "Hot Streak · 7 in a row · Shield ×2" or "Diamond Hands · 10 rounds · Shield ×2"): every player gets 1, 2 or 3 shields for the whole tournament (shown on the tournament, for example "Shield ×2").
  • During a round, until picks close, a player who has picked a side can raise one shield for that round (by holding the Shield button), and lower it again; at most one shield per round. A raised shield stays raised if the player is disconnected.
  • If the pick is wrong, the shield cancels what it would have cost: in Sudden Death (and in any Sudden Death final) the player is not out, in Extra Lives they lose no life, in the race of a Hot Streak their streak does not go back to 0 (it stays where it was), and in the race of a Diamond Hands the diamonds in their hand stay as they were (they do not grow). A wrong call saved by a shield still counts as a wrong call in the statistics (for example, it ends a run of right calls, except in the race of a Hot Streak).
  • A raised shield is used up whether the pick was right or wrong. A shield only protects a side the player picked themselves: it is never raised automatically, has no effect on a side picked automatically or on a missing pick (No Auto-Pick), and is not used up then.
  • During the draw, everyone sees how many shields are up, never whose; after the result, the screen shows who was saved. Raised shields are sealed with the picks before the draw and published in the same files ("shield"), so every save can be checked.
  • The Shield twist cannot be combined with Points Race, Heads Up, Twin Toss or Respawn.
• The No Auto-Pick twist (with every mode and every other twist, shown as "Sudden Death · No Auto-Pick" or "Extra Lives ×3 · Shield ×2 · No Auto-Pick"): no side is picked for you, and a player with no pick in time is treated as wrong (loses a life; in Sudden Death, is out).
  • Outside Heads Up, if nobody picks in time, the round is void and replayed; after 3 such rounds in a row, the tournament ends with no winner and the whole prize is added to a later tournament.
  • In a Points Race with No Auto-Pick, a missed pick scores no point during the points rounds, and a points round where nobody picks still counts; the rules above apply in its final.
  • In a Hot Streak with No Auto-Pick, a missed pick sends your streak back to 0 during the race, and a race round where nobody picks still counts; the rules above apply in its final.
  • In a Diamond Hands with No Auto-Pick, a missed pick loses the diamonds in your hand during the race (unless you held Bank, which banks them first), and a race round where nobody picks still counts; the rules above apply in its final.
  • In a Twin Toss tournament with No Auto-Pick, a coin you don't pick counts as wrong; a round counts as a round with no pick only if nobody picked either coin.

Void rounds, incidents and the end

• If a round would eliminate everyone, it is void and replayed with the same players, and nobody loses a life. In Extra Lives, if everyone is wrong but some players still have a life left afterwards, everyone loses a life and the round counts. This does not apply to the points rounds of a Points Race, nor to the race rounds of a Hot Streak or a Diamond Hands, where nobody is out.
  • In a Twin Toss tournament, the round is void only if both coins together would knock out every player still in.
  • In a Respawn tournament, this is decided on the players still in only (never on the ghosts), and a void round counts for nobody: no ghost streak moves and nobody comes back.
  • In a Shield tournament, a player who raised a shield on their pick is never knocked out, so a round where one did is never void: if the last two players are both wrong and only one raised a shield, that player wins; if both did, nobody is out and the round counts (both shields are used up). A void or cancelled round uses no shield.
• If a technical incident prevents a fair draw (fingerprint not recorded on Base within 30 seconds of picks closing, public draw unavailable, a game server not responding for 30 seconds), the round is cancelled and replayed (in Heads Up, the cancelled flip is replayed with the same duels, and does not count as a draw). After more than three cancelled rounds in a row, or a failure lasting more than 30 minutes, the tournament is paused and its restart date is announced within 48 hours. If it cannot restart within 7 days, the prize is shared equally among the players still in (in a Points Race paused before the end of its points rounds, among the players with the best score after the last valid round; in a Hot Streak paused during its race, among the players with the longest streak after the last valid round; in a Diamond Hands paused during its race, among the players with the most diamonds after the last valid round, once what was in their hand is banked).
• The organizer may cancel a tournament before it starts (before the lobby). Once rounds are played, it can only be paused as described above.
• The tournament ends when one player is left. It also ends after 64 rounds (void and cancelled rounds included; in Heads Up, extra flips and cancelled flips are not counted; in a Points Race, a Hot Streak or a Diamond Hands, the rounds of the race are included; in Twin Toss, the two coins of a round count as one round), in which case the whole prize is shared equally among the players still in. In a Respawn tournament, the ghosts who come back after a round are counted before checking who is left: if only one player is left in play but ghosts come back after that round, the tournament goes on. It never waits for ghosts whose streak is not complete.

Prizes

• The prize is always shown on the page of a prize tournament, with the way it is shared.
• How a prize is shared depends on the tournament: its mode, its twists and its number of players. Sometimes the winner takes it all; sometimes it is shared between the top 2, the top 3, and so on.
• Who comes after the winner: the players who went out last. In Heads Up tournaments, that is the player who lost the final, then the players who lost in the round before; a player who had no opponent in a round is not eliminated in that round. In Respawn tournaments, a player who came back and was out again is ranked by their last elimination, and a round counts as a round where someone was eliminated even if ghosts came back after it.
• Players eliminated in the same round share equally. A share under 1 USDC and leftover cents are not paid: they go to a later tournament's prize.
• Prizes are paid in USDC on Base (a public blockchain compatible with Ethereum) to the wallet linked to the account, once the winner checks below are done. The wallet cannot be changed while you are checked in to a tournament or while a prize is waiting to be paid. A winner who lost access to their wallet can ask us for a payment to a new address; we first make sure the request comes from the account's owner.
• Winner checks: before paying a prize, we check that the win follows these rules (one account per person, no bots or scripts), and we may write to the winner at their account's email address. A winner who does not answer within 14 days loses the prize, which goes to a later tournament. Prizes are paid within 7 days after the checks, and no later than 30 days after the tournament. A winner whose prize is refused (checks not passed, fraud) is no longer counted as the winner of that tournament: it is shown as "prize refused" and removed from their wins and rankings.

Public profile

Every player has a public profile page showing their display name and avatar, the date they joined, tournament history (rank, rounds survived, prizes won, and a link to the picks made in each tournament), training records, medals and rewards (the avatar colors, frames and icons unlocked by playing). It never shows your email, country or full wallet address.

Friends

You can send a friend request from a player's profile. Your friends list, your requests and your notifications are only visible to you, on your page. You can remove a friend, block a player, or stop receiving friend requests in your settings. A request left unanswered expires after 30 days. There is no messaging between players.

Fairness

Every result comes from the public drand randomness beacon. The fingerprint of all picks is recorded on Base, a public blockchain, and the round uses the first drand draw emitted at least 3 seconds after that record: when picks are sealed, it does not exist yet. Anyone can check every round on the tournament's verification page. How the draw works.

Training

Training is free practice, with its own leaderboards (day, week, month and all time, in UTC). It has no prize of any value: it only unlocks cosmetic avatar rewards. It uses our server's random generator instead of drand, and never counts for tournaments. To keep it fair and bot-free, flips are limited to one every 0.7 seconds, and per day (UTC) to 100 without an account (not saved), 500 with an account, and 5,000 once the account is complete (profile and wallet).

Contact

For any question or complaint, write to contact@tossking.com.