Is there just one theme?
Yes, all locations all over the world share the same theme for the jam.
I want to know the theme!
For the usual in person GGJ the theme is announced at each local jam site after 17:00 local time on Friday. Time zones from New Zealand to Hawaii are all participating. As we aim for all jammers to have the same experience we ask everyone to keep the global theme a secret until the last region (Hawaii) starts. We announce the theme on our website and social media after Hawaii has joined the jam.
For GGJ Online in 2022 we will be announcing the theme globally at the same time some time before the jam starts on 20 Jan 2022. Given the nature of GGJ 2022 allowing for multiple formats there will be no need to keep the theme secret and we ancourage everyone to share it far and wide with your social networks.
For themes from past years, see the Global Game Jam® History.