gbcompo21

Create original games, demos, homebrews tools and music for the original Game Boy (Color) and compete for glory (and up to $3000+ in prizes)!

Join the GB COMPO 2021 from July 1 to October 1 at itch.io/jam/gbcompo21


Sponsors

The entire prize pool is community funded. Donate or sponsor the competition through GitHub sponsors.

Incube 8 Games

Greenboy Games Catskull electronics Mega Cat Studios Bitmap Soft 1st Press Games

Donations from Individuals

Toxa, Carles Castillo, Dave VanEe, Chris Maltby, William Bettridge-Radford, Josh Frisby, Sanqui

Partners

GB Studio Central GB Studio RetroBreak

Donations to the Prize Pool:


Community

Come join us on Discord or others for help getting started, and head over to gbdev.io for useful links & resources!

We’d love to hear from participants, share your progress on Twitter using the #gbcompo hashtag and join the conversation the on Discord #compo-chat channel!

Resources

Here a curated list tools and documentaiton to get you started.

Prize pool

The current prize pool is $3000+ and will be split according to this document.

Entries will compete in 4 separate categories and 4 rankings will be drawn up. Based on these leaderboards, the top entries will be awarded as follows:

The rankings are decided according to the JUDGING criteria.

Open Source Bonus

If you publish your game source code and assets on a public repository (e.g. GitHub) under an open source license (GPL, MIT, Apache, CC0…) you get 20% more of the prize as a bonus!

Prize tiers are still work in progress, expect changes. Money prizes are subject to fees and conversions. They may be delivered as gift cards of your choice.

Rules

  1. Final entry “deliverable” must consist of a GB or GBC ROM file. You can also attach descriptive documents in TXT, Markdown or HTML file format (e.g. game manual).
  2. The ROM file will be tested on real hardware (usually a DMG or a GBC) and on the BGB emulator. In case of different results, the hardware test will be the trusted one.
  3. GBC features are allowed.
  4. SGB features are allowed. The entries will be evaluated mainly on Game Boy (Color). You can use SGB features, but don’t rely on them as main features for your entry.
  5. Teams are allowed (award will be split).
  6. The competition is focused on games, but you are allowed to submit homebrew tools, demos and music cartridges. There may be special category prizes for those. There are no preferred themes.
  7. ROM Hacks are not allowed.
  8. NSFW content is not allowed. Please keep it safe for work and avoid anything overly edgy or distasteful.
  9. You can submit more than one entry. They will be rated separately, but each person or team may only accept prizes on behalf of a single entry (e.g., you can’t win both the 1st and 2nd place prize).
  10. Judges can submit entries, but they are not eligible for prizes.
  11. Only some official MBC chips (MBC1, MBC2, MBC3 and MBC5, as well as no MBC at all) are allowed. The only exceptions are:
    1. While Nintendo only manufactured very specific MBC+ROM combinations, we will allow any power-of-two ROM size between 32 KiB and the maximum for the chosen chip. (This is simply a convenience feature, as any ROM image can be extended to fit a larger ROM chip by appending copies of itself.)
    2. The ROM+RAM combination (i.e., without an MBC, up to 32 KiB ROM and 8 KiB SRAM), with or without battery, will be accepted for compatibility, as many people have simple flash carts that do have SRAM but don’t have an MBC. (This can be trivially emulated by any MBC1, MBC3 or MBC5 configuration.)
    3. The variants MBC30 and MBC1M are accepted, as they have been used in licensed games.
    4. Some official MBCs added extra components to the cart: MBC3/MBC30 carts could have an RTC, and MBC5 carts could have rumble. These combinations, and only these combinations, will be accepted. In particular, this means it’s impossible to have RTC and rumble in the same cart.
  12. Entries cannot rely on extra hardware or add-on devices, they must be playable without a specific setup.
  13. As long as you produce a GB or GBC ROM file that runs on GB/GBC, any tool to develop the entry is allowed. This includes RGBDS (ASM), GBDK (C), ZGB (C), GB Studio, …
  14. Source code is optional, but very much appreciated. Entries submitted with source code (public repositories on GitHub/GitLab/… are accepted) and with an open source license (See rule 15) are eligible for additional prizes. Make sure to fill the “Open Source repository” field with a valid and public repository when submitting on itch.io. See this issue for further details.
  15. To be eligible for the OSS bonus, the code must be licensed under an “Open Source” license (any of the “Free” license listed here is accepted). Assets can be licensed under any of the CC licenses. Obfuscated code, non-reproducible builds, intentionally making the source code hard to read/re-use will exclude the entry form the OSS leaderboards. This is at discretion of the hosts and judges. We must be able to read the code and compile it into a working ROM, running a script or following istructions.
  16. The entry must be submitted on the itch.io jam page.
  17. Your work must be new and original. You cannot enter with something you were already working on before the start of the jam. The majority of work should be done during the jam. If in doubt, please ask us before proceeding.
    Examples of things that are allowed:
    • A brand new game using your own (or any) existing game engine.
    • A remake of your (or someone else’s) game for a different platform, but with new code and assets.
    • A brand new game you barely started (e.g. you only made a title screen or a mockup of the gameplay).
    • Using templates, tutorial code as starting point (when they’re license allow to do so, e.g. gb-boilerplate)
    • Asset packs for art and music are ok if the licensing permits. Be sure to make note of what is being reused and under what terms. Use of pre-made assets (vs original ones) may be factored in when judges assess points for relevant criteria (e.g. graphics, audio).

    Examples of things that are not allowed:

    • A project you’ve been working on for months.
    • An update/patch for a game you already released publicly.
  18. The submission must be available for free for the public (and not only the judges). Submission will be published and kept online for free on the competition website, while you are free to keep working on it (and eventually charge for it/make commercial usage).
  19. Multiple submissions are allowed.
  20. If your submission contains text that isn’t available in English, some judges might not be able to read that text, and they will judge accordingly.

Judging

Judges will evaluate submissions using the following criteria:

  1. Gameplay - How entertaining are the gameplay mechanics? How fun is the game?
  2. Technical - How innovative is it from a technical perspective? Does it push the hardware to the limit?
  3. Originality - How refreshing is it from a non-technical perspective? Does it have a unique design / mechanics?
  4. Graphics - How impressive are the art, animation and visual effects?
  5. Audio - How good are the music and sound effects?

Criteria applicability:

The leaderboards are computed by averaging the “Overall” score.

FAQ

Something not clear? Open an issue or join the discussion on Discord.

CREDITS

Special thanks to: