C3 Arena
A tournament platform for the Cossacks 3 community: brackets, predictions, streams, rating and a ranked-play mod
- ClientC3 Arena
- Year2026
- PlatformsWeb · Supabase · Discord · Game mod
- TimelineSince 2026, ongoing
About the project
C3 Arena is home for the Cossacks 3 strategy community. The first event on the platform is UNDERGROUND 2026: Cup of Olympus with 45 players. The site runs the bracket, keeps the rating, takes predictions in in-game gold and posts updates to Discord by itself, while a game mod adds ranked 1v1 and 2v2 matches right in the lobby.
- Product
- Design & brand
- Web platform
- Database & roles
- Discord integration
- Game mod
Challenge
Community tournaments lived in spreadsheets and chats: brackets were kept by hand, results got lost and there was no rating at all.
- Double elimination for 32 players with qualifiers: every result moves two people
- Make the tournament exciting for viewers, not just players
- Players from different countries: Russian, English and Ukrainian
- Get results straight from a game that can't make proper HTTP requests
Solution
We built a platform where the organiser enters one score and everything else happens on its own: bracket, rating, predictions, Discord and a streamer overlay.
- A series score moves the winner and loser into their next matches and recalculates Elo
- Predictions in in-game gold with odds that move with the pool on each side
- An OBS overlay and embedded streams on the match page
- The mod adds “Ranked 1v1/2v2” buttons to the lobby and reports the result to the server after the game
What we did
Every part of the product is our work
- 01
Tournament brackets
Qualifiers, upper and lower brackets, grand final and result rollback.
- 02
Gold predictions
1000 gold to start, odds from the pool, a history of every transaction.
- 03
Elo rating
A tournament rating plus separate arena ladders for 1v1 and 2v2.
- 04
Streams & overlay
A betting-pool card for OBS and a player on the match page.
- 05
Discord
Discord login and auto-posts: match time, live, result.
- 06
Roles & moderation
Player, organiser, admin and super admin, bans with a reason.
- 07
Game mod
Ranked 1v1/2v2 matchmaking in the lobby and match reports to the server.
- 08
Results server
A match counts once the loser confirms; disputes show up right away.
- 09
Brand
Logo, main-menu art and loading screens for the mod.
Outcome
45
players in the first tournament
77
matches in the double-elimination bracket
3
languages: Russian, English, Ukrainian
Next project
C3 Arena Mod
A modification of Cossacks 3: one-click ranked matches, Elo, anti-cheat and a new interface
