All the informations and details about Worldwide Combos games modes and rankings.

The matchmaking only depends on players' multiplayer ratings and waiting times. Once the absolute difference between two player's ratings is under 10 times the maximal number of seconds these players have been waiting (that is, the waiting time of the player who joined the queue first), then these two players are matched against each other.

When playing Custom games, the room creator decides the maximal length of a round (possibly infinite), the KO limit (possibly infinite), and the handicap type (note that time and KO limits can't be both infinite at the same time). However, in a Quickplay or Tournament round, such rules are already decided in advance. For tournament rounds, refer to the corresponding tournament page to check them. In a Quickplay round, the rules are: no KO limit, handicap with holes, length of 2 minutes.

The goal is to knock out your opponent as much as possible. Your opponent is knocked out when there isn't enough space for the next block to spawn at the top of the grid. Then, handicap lines on the opponent's side disappear and the round continues. If one of the players reaches the KO limit (assuming there is one), then the round ends. If the time limit is reached (assuming there is one), then the round ends (no hurry-up or tie-break). If a player tops out despite having no handicap lines to cope with, then the round ends and this player loses.

The winner of a round is the player who got the biggest number of KOs. If this number is the same for both players, then the player who sent the most lines wins. If there is still a tie, then the player with the lowest stack at the very end of the round wins. If there is still a tie, then nobody wins.

Note that, in order to avoid stalling at the end of a round (e.g. to keep one's advantage in terms of KOs), the current block when the round ends is automatically hard dropped two seconds after the round has ended (to make sure that the opponent's field was updated correctly), and the consequences are taken into account (extra KOs, extra lines, for instance).

First of all, not all multiplayer rounds are taken into account. Only Quickplay and Tournament rounds do have an influence on the multiplayer rating. Note that, Tournament rounds do not make the ratings update automatically: for now, at the end of every tournament the ratings are recalculated to take this tournament matches into account.

Only users with a validated Worldwide Combos account may appear in the rankings. People with a rating that equals 1000 (which is the initial rating for every new player) do not appear no matter what.

The rating itself is very similar to an Elo rating. Let's say two players with ratings
equal to `R1`

and `R2`

play against each other. The new ratings will
be `R1' = R1 + 20*(RES - 1/(1 + pow(10, (R2 - R1)/400)))`

and
`R2' = R2 + 20*((1-RES) - 1/(1 + pow(10, (R1 - R2)/400)))`

, truncated to two
decimals, where `RES`

is a value between 0 and 1 inclusive which depends on the
round's outcome.

If there is a tie, then `RES = 0.5`

. Now let's assume that player 1 wins
with `KO1`

KOs and `L1`

lines, while player 2 had `KO2`

KOs
and `L2`

lines.

- If
`KO1 = KO2`

and`L1 = L2`

, then`RES = 0.6`

. - If
`KO1 = KO2`

and`L1 > L2`

, then`RES = 0.7`

. - If
`KO1 > KO2`

, then`RES = 0.7 + 0.3 * min(log(1+KO1-KO2)/log(21), 1)`

.

`RES`

with `1-RES`

.
There are also bonus points that are awarded to newcomers. Every player can win at most 200 bonus points. After every round, if the player who got a positive rating change can still win bonus points, then some are awarded. The number of bonus points won is either the number of points that were won on that round, or the number of remaining bonus points (whatever is smaller).

Ghostbuster consists in playing against a replay (or a "ghost"), in a format that is quite similar to multiplayer rounds: the replay is picked by the server according do your current Ghostbuster rating. Rounds last two minutes by default, with no KO limit. Time and KO limits can be changed in the Game settings; however, rounds that are played with settings that are not the default ones are not rated. Two handicap types are available: solid handicap and handicap with bombs.

The goal is to knock out the replay as much as possible. The replay is knocked out when there isn't enough space for the next block to spawn at the top of the grid. Then, handicap lines on its side disappear and the round continues. If either the player or the replay reaches the KO limit (assuming there is one), then the round ends. If the time limit is reached (assuming there is one), then the round ends (no hurry-up or tie-break). If the player tops out despite having no handicap lines to cope with, then the round ends and the player loses.

The player wins if they got the biggest number of KOs. If this number is the same for both the player and the replay, then the player wins if they sent the most lines. If there is still a tie, then the player wins their stack at the very end of the round is lower than the replay's. If there is still a tie, then nobody wins.

Replays are taken from previous ghostbuster rounds that were played in the past. Every replay has its own rating, which is initially determined by the player's current rating at the moment when the round is completed. Every time a replay is used the replay's rating is updated according to the round's outcome. Note that, in order to balance replays more fairly, some rating adjustments might be done regularly.

When a Ghostbuster round starts, the replay is chosen in the following way: the available replays which are at least as long as the expected maximal round duration are sorted according to their absolute difference with the player's Ghostbuster rating. The server picks the 10 first replays in such a ranking, and chooses the one which was the least used until now. In case of a tie, the replay with the smallest absolute rating difference is chosen.

First of all, only rounds that last 2 minutes with no KO limit do have an influence on the multiplayer rating. Only users with a validated Worldwide Combos account may appear in the rankings. People with a rating that equals 1000 (which is the initial rating for every new player) do not appear no matter what.

The rating itself is very similar to an Elo rating. Let's say the players with
`R1`

rating plays against a replay with `R2`

rating. The new ratings will
be `R1' = R1 + 20*(RES - 1/(1 + pow(10, (R2 - R1)/400)))`

and
`R2' = R2 + 20*((1-RES) - 1/(1 + pow(10, (R1 - R2)/400)))`

, truncated to two
decimals, where `RES`

is a value between 0 and 1 inclusive which depends on the
round's outcome.

If there is a tie, then `RES = 0.5`

. Now let's assume that the player wins
with `KO1`

KOs and `L1`

lines, while the replay had `KO2`

KOs
and `L2`

lines.

- If
`KO1 = KO2`

and`L1 = L2`

, then`RES = 0.6`

. - If
`KO1 = KO2`

and`L1 > L2`

, then`RES = 0.7`

. - If
`KO1 > KO2`

, then`RES = 0.7 + 0.3 * min(log(1+KO1-KO2)/log(21), 1)`

.

`RES`

with `1-RES`

.
There are also bonus points that are awarded to newcomers. Every player can win at most 200 bonus points. After every round, if the player got a positive rating change and can still win bonus points, then some are awarded. The number of bonus points won is either the number of points that were won on that round, or the number of remaining bonus points (whatever is smaller).

Sprint is a single-player mode that consists in clear 40 lines as fast as possible. The challenge is completed when 40 lines have been completed, and the elapsed time is the number of milliseconds between the start of the game and the moment when the last block was placed. If the player tops out, then the challenge is failed, and the game's replay is not saved.

Even though this mode uses a 7-bag randomiser like every other mode, some of the bags cannot appear in the first bag: while the first block is either an S-block or a Z-block, the upcoming blocks are generated once again.

Only users with a validated Worldwide Combos account who completed the Sprint challenge at least once appear in the main rankings.

Players are ranked according to their best sprint time, in increasing order. If there is a tie, then the tie is left as is.

Only users with a validated Worldwide Combos account who completed the Sprint challenge at least ten times appear in the main rankings.

Players are ranked according to the sum of their 10 best sprint times, in increasing order. If there is a tie, then the tie is left as is.

Survivor is a single-player mode that consists in avoiding to top out as long as possible. Handicap lines spawn from the bottom, and the time interval between two consecutive handicap lines decreases with time. When a new player signs up, only Normal Survivor is available, and Elite Survivor (see below) is unlocked after reaching 4 minutes in that Normal Survivor.

In Normal Survivor, there is one handicap line that appears at the very beginning of a game. Now let's
say that `n`

lines already spawned. The waiting time before the next handicap line is
approximately `log(12) / log(4 + 0.033 * (n-1) * (n-1) / (6 + n))`

seconds.

Elite Survivor is unlocked when reaching 4 minutes in Normal Survivor mode. This mode is very similar to the previous one; yet, the pace is much faster, and it was meant to be for fast players, for whom the Normal Survivor's speed might be a little bit boring in the beginning.

In Elite Survivor, there are three handicap lines that appear at the very beginning of a game. Now let's
say that `n`

lines already spawned. The waiting time before the next handicap line is
approximately `log(5) / log(4 + 0.007 * (n-3))`

seconds.

Only users with a validated Worldwide Combos account who completed the Normal Survivor challenge at least once appear in the main rankings.

The rankings are divided into two: first all the players who unlocked the Elite survivor mode are ranked, then all the other players are ranked as well. Players who unlocked the Elite survivor are ranked according to their "personal best", which is either their Elite survivor longest survival time, or their Normal Survivor longest survival time, minus 4 minutes (whatever is longer), in decreasing order. Other players are ranked according to their Normal Survivor longest survival time, in decreasing order.

Players in green are those who unlocked the Elite survivor mode. If there is a tie, then the tie is left as is.

Warm-up mode is a solo mode with no particular goal: there is no time limit, no KO limit, and there are no handicap lines. There is no countdown before the game starts. If the player tops out, then the field is completely cleared, and the player can start playing again from scratch. There are no saved replays in this mode.

Worldwide Combos 0.10.2 - Noël Nadal

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