IIDX Rules

beatmaniaIIDX 26 Rootage logo

R∞tage: Infinity Stage IIDX Tournament

Infinity Stage is pleased to include beatmaniaIIDX 26: Rootage in its lineup!
You may be the DJ…but can you hit the key?


  • Qualifiers will be primarily remote, and will run for at least one month.
    • Remote qualifiers accepted until Friday, August 9, 00:00 PT
    • On-site qualifiers available on Friday, August 9, 18:00~23:59 PT

  • The tournament will be a blended format single division.
    • Remote qualifier seeding will be used to create a double-elimination bracket with 40 players.
      • The top 24 seeds will be placed in the top 24 slots according to seeding order.
      • The remaining seeds will play a round of gauntlet with a four-song set. The top 16 places from the gauntlet round will fill the remaining 16 bracket slots according to gauntlet result order.
    • The double elimination bracket will run until only four players remain (top 2 winners’ side and top 2 losers’ side).
    • The top 4 will play a round robin, and the outcome will determine podium placement.

  • Because the tournament is a single division, all players are eligible to receive Infinity Stage points.

Contact Info

Infinity Stage Schedule: Saturday, August 10th (1:00pm PDT – 11:00pm PDT) and Sunday, August 11th (11:00am PDT – 1:00pm PDT)

Infinity Stage Discord: Click Here to Join the ISSJ Discord

Infinity Stage Twitter: @InfinityStageSJ

Tournament Organizers:

  • Oliver Wing
    • Discord: Telperion#4649
    • Twitter: @RI74TA
  • Avri Rahamim

Detailed Tournament Rules


You MUST register on smash.gg before submitting your qualifiers.

Please submit your qualifiers to: IIDX Qualifier Submissions Form

Entrants must choose any trio of these charts, and submit the following in an form to: IIDX Qualifier Submission Form 

      • Their smash.gg username
      • Photos of their scores on the three charts (no duplication) of their choice
        • Official, legal arcade (Rootage at Round1 and offline SIRIUS-Lincle) or INFINITAS scores are acceptable
        • No CS scores or unofficial arcade scores will be accepted
        • Photos must be submitted – screenshots, eAmuse snapshots, or scorebot posts as lone forms of proof will not be accepted
        • Scores must be obtained during the qualifying period
    • Seeding will be calculated as a sum of EX score on the three charts.
  • The deadline for remote qualifiers is Friday, August 9th, 00:00 PT.
  • There will be on-site qualifiers on Friday, August 9th, from 18:00 to 23:59 PT. On-site qualifying will have priority over casual play during this time. If you intend to qualify on-site, please let the tournament organizers know in advance.
    • If you are qualifying on-site, you will be granted exactly two Free Mode rounds to play any three (or four) of the qualifier songs of your choice. A TO must observe both of your rounds. Your best trio of charts from these two sets (no duplication) by total EX will constitute your qualifier.
  • Any entrants who do not submit qualifier scores will be seeded as if they received zero total EX.
  • Except in the case of unprecedented attendance, there will be no entrant cap for the IIDX tournament, but all entrants are required to submit a qualifier regardless.
  • The specific set of qualifier songs and charts is yet to be determined, but it will be announced at least one month prior to the event.
  • Qualifier standings will be secret until the on-site qualifying period is over. The standings and initial bracket will be posted publicly at Saturday, August 10th, between 00:00 and 01:00 PT.

Tournament Format

General Info

  • We will be on a pretty tight schedule! Please keep tabs on the tournament progress and be present when it is your turn to play. You may have as short as a fifteen-minute notice to appear before receiving a DQ.
  • If you are entering multiple tournaments, please let the TOs know so they can try to accommodate you – but no guarantees.
  • All tournament play will be done on Free Mode.
  • All options except H-RAN, EXPAND JUDGE, LEGACY NOTE, and AUTOSCRATCH are allowed.
    • This includes all gauge types available in Free Mode and all other note permuter options (randoms).
    • Note that if you fail the song due to draining HARD or EX gauge, you will not be allowed to replay it.
  • All players must use Camera option A (Split view of Music Video and handcam) with score pacemaker graph opposite from the note lane. This is for a consistent stream broadcast experience.

Gauntlet Phase (Seeds #1~#24 exempted)

The first stage of the tournament will be run as a gauntlet with a four-song set.

  • Each player will be competing against every other player simultaneously.
  • The songs will be chosen at random from a preselected list released about a month in advance alongside the qualifiers.
  • The four-song set will consist of Lv.7~11 charts, where at least one chart is a Lv.7 and one chart is Lv.11.
  • Each player seeded 25th or below will play the four charts once in any order.
  • Once each player in the gauntlet has recorded their attempt, scores for each song are ranked – the best score receives a rank 1, the second best a rank 2, etc. If two players tie on a song, they receive equal rank for it.
    • Consider this partial gauntlet result:
↓ Players \ Songs → Fly Above [a]
Iroha 1990
Lilith 1969
Siren 1990
Zilch 2019
    • Zilch takes rank 1 for Fly Above, Iroha and Siren both receive rank 2, and Lilith comes in at rank 4.
  • Cumulative rank is calculated by summing the reciprocals of ranks; a higher result is better.
    • Reciprocal of rank is meant to reduce the effect of one bad score in an otherwise good performance.
    • For example: Celica obtains song ranks of 5, 7, 3, and 15. Her totaled rank will be: 1/5 + 1/15 + 1/3 + 1/7 = 0.200 + 0.143 + 0.333 + 0.067 =0.743 (comparable to 5.384 overall)
    • For contrast: Erika achieves song ranks of 6 across the board. Her totaled rank will be: 1/6 + 1/6 + 1/6 + 1/6 = 0.167 + 0.167 + 0.167 + 0.167 =0.667 (comparable to 6.000 overall)
    • In this case, Celica places higher for the gauntlet than Erika based on cumulative reciprocal rank.
  • The 16 players with the best result for the set will move up to double elimination, and will be placed in slots #25~#40 according to their gauntlet rank.
    • In the (fairly unlikely) event of ties for gauntlet rank, each tie will be broken using a one-song card draw from the same preselected list as the gauntlet set, and the tied players will be sorted into unique placement based on their EX score on that song. The process will be repeated until all ties are broken.

Double Elimination Phase (Bracket of 40)

The second stage of the tournament will be run as a NCAA rules double elimination bracket.

  • Each match will be card draw format. (app link [F/C])
    • Before Round of 8: best-of-3 / first-to-2
    • Round of 8 and after: best-of-5 / first-to-3
  • Difficulty ranges and weights are TBD, but will gradually increase through the rounds (i.e., the first round will have a much higher chance of drawing a lower difficulty chart, and a much lower chance of drawing a higher difficulty chart, than the last round).
    • [TBD]
  • Only Another charts in the difficulty range will be selectable.
  • No unlocks (rainbow-colored), paseli-bound (ARC SCORE / X-DEN / etc.), or †LEGGENDARIA charts will be selectable.
  • We will use a protect+veto style card draw (see “How does the card draw work?” for details).
  • Each song is win/lose based on EX score.
  • In the event of a song tie, neither player receives a match point for it.
  • In the event that neither player has accumulated enough song wins by the end of the card draw, individual songs with the same difficulty bounds and weights will be selected via the randomizer app and played until a match winner can be identified.

  • The double elimination phase of the tournament will run until there are two players left in the winners’ side and two players left in the losers’ side. Those four players constitute the Final 4 and move on to the final stage of the tournament.

Round Robin Phase (Final 4)

The final stage of the tournament will be run in a Round Robin format.

  • For the purposes of describing format, the two remaining players in the winners’ bracket are labeled A (higher seed) and B (lower seed), and the two remaining players in the losers’ bracket are labeled C (higher seed) and D (lower seed).
  • A round robin of four players requires six matches. Match order is as follows:
    • C vs. D
    • B vs. C
    • A vs. D
    • B vs. D
    • A vs. C
    • A vs. B
  • Each match will be best-of-5, first-to-3 song wins. Charts will be chosen by a 7-card draw, with the same protect+veto rules as in the double elimination phase.
  • Each song is win/lose based on EX score.
  • In the event of a song tie, neither player receives a match point for it.
  • In the event that neither player has accumulated enough song wins by the end of the card draw, individual songs with the same difficulty bounds and weights will be selected via the randomizer app and played until a match winner can be identified.
  • After all six matches, players will be ranked according to match wins to determine overall tournament 1st, 2nd, 3rd, and 4th places.

Time-Sensitive Modifications

We hope to avoid such extenuating circumstances, but if the tournament becomes heavily time-constrained, the format may be abridged to ensure it completes. Some sample abridgements include:

  • Reducing the size of the double elimination bracket to top 32 (with 24 pre-seeded) or top 24 (with 16 pre-seeded). In these cases, the gauntlet would take up the unslotted players.
  • Replacing the Final 4 with a KAC-like setlist ranking:
    • Each finalist selects a tournament-legal chart (same Final 4 level restrictions apply). The four charts are assembled into a set.
    • Each finalist, from lowest to highest seed (D C B A, if following the Round Robin labeling), plays the set one at a time on their preferred cab.
    • Individual song rankings are determined by EX score result.
    • Overall ranking for the round is as follows:
      • The first place player for a chart receives 2 points, the second receives 1 point, and third/fourth places receive no points for the chart.
      • The sum of points earned for all four charts determines the winner.
      • Any ties (whether single-song or overall ranking) will be resolved progressively using individual song draws.

How does the card draw work?

We will use a protect+veto style card draw.

  • There are three “advantages” available: machine preference, protect order, and veto order.
  • The player with the higher seed will get first choice of advantages. The lower seed then chooses one of the remaining two options, and the third is given to the higher seed. (When choosing protect order or veto order, it’s customary for the player to specify immediately who will protect or veto first.)
  • At this time, the TO will randomize a set of 5 charts (best-of-3 rounds) or 7 charts (best-of-5) using the card draw app.
  • The player chosen to protect first will select a song to mark “SAFE”, solidifying it as part of the set.
  • The other player will then get their own choice of song to protect.
  • The veto-first player will then choose a song to “VETO”, eliminating it from the set, followed by the other player’s veto.
  • The two “SAFE” songs and the unremoved song(s) will then be played in the order they were drawn, unless both players agree to play in a different order.

  • For example: Duel (#19) and Ameto (#14) are about to play a match. As higher seed, Ameto gets first pick of advantages, and she chooses to protect second. Duel selects the left cab, and veto order defaults to Ameto, who chooses to veto second as well.
  • Their card draw is:
  • Duel chooses to protect Flashes, and then Ameto chooses to keep HEISEI. Duel then vetoes Sigmund, and finally, Ameto throws out GOLD RUSH.
  • Thus, Ameto and Duel will play 焱影, then Flashes, and if necessary, HEISEI.

Unallowed Options (highlighted in red)



  • Do I get to warm up? Due to time constraints, warm-ups will not be built into the tournament format until Final 4. For each match in Final 4, both players are granted one Free Mode set after machine selection but before their card draw.
  • If you have concerns about “feeling out” or getting used to the Round1 ESC machines, please arrive before qualifiers on Friday or before the tournament on Saturday to get your testing in.
  • If a cab happens not to be in use during a match (in the case of 1P+2P play on a single machine, or lapses in gauntlet), it will also not be available for warm-ups.
  • What happens when two players want to use the same machine? If both players are amenable to using the same machine concurrently, they can agree to do so before the cards are drawn for their set. Otherwise, the player who chose machine preference will take priority.
  • What if severe hardware issues interfere with the side I want to play on one of the machines? In this case, the machine preference advantage will be removed from card draw, and TOs will assign players based on machine capacity. If it’s bad enough that players must play sequentially, “machine preference” becomes “play order”.
  • There was a cab malfunction while playing my song. What happens then? If a cab malfunction happens, immediately notify the TO. The TOs will check the status of the cabinet, and if deemed true, will allow the player to replay that song (not the entire set). If player claims a malfunction and the TO check shows that the cabinet was not at fault, the player will be given a loss for the entire set.
  • I forgot I had EX/Hard gauge on, Sudden+ or FHS turned off, chose the wrong lane permuter, etc. and failed out of the song. Can I replay? No! It’s the player’s responsibility to check their settings before the song begins. Replays will be only given for cabinet malfunctions.
  • Can I use headphones? Both IIDX machines at Round1 ESC have headphone amps that you are free to use; plugs are ¼” and 3.5mm adapters will be available as well.
  • Oh no! I dashed out to grab food and received notice that my match is coming up. There’s no way I can make it back in time! Can you stall for me? You will receive a fifteen-minute advance notice. If we don’t hear from you within that time – absolutely not. If we do, we can stall only if players are present for other matches in the same round and willing to play. As soon as your match holds up the bracket from proceeding to the next round, you have five minutes to appear or you risk DQ.
  • When can I go home for the day? This is still TBD pending the overall schedule, but we intend to play no tournament matches after midnight on Saturday. Get some sleep! Don’t party too hard…

Ruleset Revisions

Version Date Author Brief Summary of Changes
0.1.0 2019-05-07 Oliver Wing Initial ruleset based on IIDX @ The Big Deal 3D
0.2.0 2019-05-17 Oliver Wing Added time-sensitive tournament format modifications