Greetings developers large, small, short, tall, and everything in between! Size Jam is a month long game jam all about exploring size kink through bite-sized games. This jam is part of SizeCon Online 2026, and the top rated entries will be featured during the convention.
While the games themselves may be small, the subject matter definitely doesn't have to be! If it's sizey, there's a place for it here in the jam: macro, micro, growth, shrinking, weight gain, inflation, blueberry, breast expansion, and beyond are all welcome.
The theme is Pulp Sci-Fi and Horror, just in time for spooky season! You're free to interpret and play with the theme however you wish. Aliens, ray guns, creepy mansions, retro robots, mad science, classic monsters—that's just scratching the surface!
This game jam is open to everyone 18 or older and from anywhere in the world. Developers may work solo or in teams, and there is no limit to how large a team may be (just make sure to credit everyone involved in the submitted game's development!).
As much of the game as possible should be made during the jam (code, art, audio, writing, and so on), though pre-existing assets that you have the legal right to use may be used so long as your game still feels like your game. If you do use external assets, make sure to provide proper credit in your game's description.
No generative AI may be used in any aspect of your game's development. That includes, but is not limited to, AI code, AI images, AI meshes, and AI audio. Likewise, AI assets must not be used on your game's Itch.io page. Beyond that, any game engines or tools are allowed (Godot, Unity, Unreal, ClipStudioPaint, Photoshop, Affinity, Blender, Maya, Crocotile 3D, etc.).
This is a kinky jam—NSFW content is not just allowed, but expected! Safe for work games are welcome too! Whether your game is super spicy or sweet and mild, be absolutely sure to include content descriptions in the description on your game's Itch.io page. Be specific. Players should not be surprised by what's in your game, only by how great the experience is!
SizeCon staff are more than welcome to participate in the game jam! However, games made by staff members (including games made by a team that includes one or more staff members) are not eligible to be featured in the live event during the convention.
Everyone who submits a game to the jam may rate the other games submitted to the jam. The end of the voting period coincides with the start of SizeCon Online 2026, and the top rated entries from the jam will be played live during a special event at the convention.
The rating criteria are as follows:
Does your game incorporate your particular size kink in a mechanically interesting or novel way?
Is your game fun to play?
Does your game have a unique visual identity? Do the graphics of your game serve the overall experience?
Does your game incorporate pulp sci-fi or horror in a meaningful, creative way?
Do the sounds and music in your game support the overall experience? Is the audio technically proficient?
Does your game run as intended? Do bugs prevent players from progressing through the game?
How is the player experience? Does the game feel cohesive across all of its elements? Are aspects of the game obvious placeholders or unfinished?
In addition to jam participants being able to rate entries, games submitted to the jam will also receive ratings and feedback from a small panel of judges with professional game development experience!
Your judges are, in alphabetical order:
Mistress Astra Ebonwing
A kitsune of many creative talents with a passion for blending reality and fantasy, Astra started as a game journalist and indie alternate reality game developer before later joining WB Games as a community manager in 2010. Astra has contributed as a writer, producer, and product manager on many major games since that time. Notable games that she's contributed to include The Lord of the Rings: War in the North, DC Comics' Infinite Crisis, Batman: Arkham City, the voxel MMO Trove, and her two favorite games: The Lord of the Rings Online and Dungeons & Dragons Online.
Jhor
Hi! I'm a self-taught game developer in the indie space. I've been making and modding games for almost 25 years, and doing it professionally for more than a decade. I've worked primarily on roguelikes, shooters, and multiplayer games!
Matt Wyman / Graghma
Spent 15+ years in NYC and LA doing start to finish full stack development on over a dozen games, mostly released worldwide. Notable companies or IPs I've worked with are Fallout, LEGO, Sony, Katy Perry, PCH, and many others you've never heard of.
Want to hang with like-minded size folks? Looking for people to team up with? Join the SizeCon Discord server!
