What Is the GMC Jam on the GameMaker Community Forum?

Updated

The GMC Jam is the GameMaker Community's own recurring game jam, run through the forum at forum.gamemaker.io. It is a time-boxed event where participants build a game around a theme, then share and discuss the results with other community members. If you already use GameMaker and want a deadline-driven reason to finish a small project, it is the forum's main recurring event for that. You do not need to be an experienced developer to take part; the structure is built around short, scoped projects rather than polished releases.

What the jam actually is

A game jam is a limited-time development sprint. The GMC Jam follows that format: a set window is announced, participants develop during it, and the community then plays, votes on, or discusses the entries. The jam has its own dedicated section on the forum, separate from the programming help boards, so announcements, rules, and entry threads stay in one place.

The forum listing shows the jam running under a sub-forum structure, with a "Community Jams" sub-forum and a "GMC Jam" section holding the announcement and discussion threads. That separation matters: it means you can follow the jam without wading through general programming posts.

How a jam is structured

The clearest example in the current forum material is The Interstellar GMC Jam 60, scheduled for October 21st, 2026 12:00 UTC to October 26th, 2026 12:00 UTC. That gives you the shape of a typical event:

  • A fixed start and end time, stated in UTC so participants across time zones share one deadline.
  • A theme, revealed for the event (here, an interstellar theme).
  • A team element, in this case "Clash of Gangs," where participants are encouraged to pick a gang and support other members of it during the jam.
  • Prizes, described as "the usual individual prizes," alongside the team framing.

The "Clash of Gangs" mechanic is worth noting because it changes the jam from a purely solo exercise into something with a social layer. You can still work on your own entry, but you are also sorted into a group and expected to encourage the others in it.

How to take part

  1. Register or log in on the forum. The jam threads sit behind the normal forum account system, and posting an entry or joining discussion requires an account.
  2. Find the announcement thread. Jam announcements appear in the GMC Jam section of the forum, with a link to fuller details. The Interstellar Jam 60 announcement, for instance, points to a "click here to find out more" page for the full rules.
  3. Check the dates against your own schedule. The window is stated in UTC, so convert it before committing. A five-day window (as in Jam 60) is the kind of span you can plan a small project around.
  4. Join the discussion thread for that jam. Each jam has its own discussion thread in the Community Jams sub-forum, which is where participants coordinate, ask questions, and share progress.
  5. Build and submit within the window, following whatever submission rules the announcement specifies.

What you get out of it

The forum's jam section is one of its most active areas by post count, and the value is mostly in the constraints:

  • A deadline that forces you to scope a project down to something finishable.
  • A theme that removes the blank-page problem of choosing what to make.
  • Feedback and visibility from other participants who play and discuss entries.
  • Team interaction, if you take part in a mechanic like Clash of Gangs, which gives you a reason to engage with other developers rather than working in isolation.

Common points of confusion

  • The jam is not the same as the general programming boards. Technical questions belong in the Programming section; jam announcements, rules, and entries belong in the GMC Jam section. Posting a jam question in the wrong place is a common first mistake.
  • The jam section has sub-forums. Community Jams sits underneath it, and individual jam discussion threads live there. If you only look at the top-level GMC Jam listing, you may miss the active thread for the current event.
  • Times are in UTC. Treat the announced window as authoritative and convert it, rather than assuming it matches your local clock.
  • JavaScript and browser version matter. The forum itself notes that JavaScript should be enabled and that an outdated browser may cause display problems, so if threads look broken, that is the first thing to check.

If you want a concrete next step, open the GMC Jam section, read the current announcement thread in full, and check whether the stated window fits your schedule before registering your interest in the discussion thread.