• Qualifiers: 1v1 single round robin, two groups. Top 4 per group advance.
• Teams: host assigns 6 duos from 8 qualifiers + 4 invites.
• Groups: 2v2 round robin, two groups, 2 legs. Top 2 per group advance.
• Playoffs: A1 vs B2, B1 vs A2; third-place match and Grand Final on the same day.

20+ accepted players: top 6 per qualifier group advance; 8 duos, two groups of four, one leg. Top 2 still advance.

• Lobby: Team VS, ScoreV2. OMC2026: (Side 1) vs (Side 2).
• Late arrival: 10 minutes = match forfeit. One host extension allowed with a recorded reason.
• Warmups: one per side, under 4 minutes total; ranked / loved / approved, no explicit content. Optional by agreement.
• Pick/ban: complete all picks and bans on the website before the match. Maps are then played in the predetermined order. TB at FT−1 each.
• FreeMod (2v2): at least one HD or HR player per team; HDHR qualifies. NF allowed but does not count. EZ / FL / HT prohibited. Violation = map forfeit.
• Disconnect: within 30 seconds, one replay. Later results stand unless a server fault affects everyone.
• Results: referee submits within 15 minutes; disputes in Discord within 24 hours.

• Default: Sat–Sun, 13:00–22:00 UTC+8. Weekdays by mutual agreement with a referee available.
• Reschedules: submit a request through #reschedules in Discord at least 12 hours before your scheduled match. The new time must be within the stage window. Opponent approval required; host resolves disputes.
• Qualifier cap: 3 matches per player per day. Final weekend reserved for ties and reschedules.
• Unable to schedule within the window despite the opponent’s good-faith attempt = host-awarded forfeit.

• A tie that decides advancement and survives the numeric tiebreakers is settled by a Bo3 on that stage’s pool — no bans, roll winner picks first — in the reserve weekend.
• An invited player who does not register by the deadline, or withdraws before qualifiers end, hands the spot to the 5th-placed qualifier with the better map win differential across both groups.
• A qualified player withdrawing before teams are announced is replaced by the next-best player from their own group.
• A main-stage player withdrawing before the group stage starts is substituted. After it starts, the team forfeits its remaining matches and places last among its group’s eliminated teams.
• Remaining placements: group standing, then map differential across both groups.

• A Mongolian flag on your osu! profile. Other flags are accepted at the host's discretion.
• No rank cap.
• All users must pass osu! official screening.
• Mappoolers and playtesters cannot play. Referees, streamers, commentators and designers may, and are never assigned to their own matches.
• A Discord handle is required, and you must be in the tournament server.