Square Enix is doing something pretty mysterious right now.
The Final Fantasy publisher is teasing something called Project Code Z.
The project, which Square Enix is tweeting about in Japanese, English and German, is due for reveal at Tokaigi 2015 on Saturday.
It's a PS4 game, but that's all we know. There's a website you can look at if you like - the central Z changes appearance, showing what looks a tree and some crystals.
The reveal will be streamed live via NicoNico.