Gantz:Next Project is a series of anounced spinoffs, currently consisting of 4 projects. The project attempts to rebuild the Gantz world and rewrite the story, using the main series' main characters, but telling an alternate plot.
- A Gantz 3DGC movie, announced for 2016
- Gantz:G, a spinoff manga currently running in Miracle Jump
- Gantz, 2 in 1 Original story (paper back)
- Gantz:X, a so far undefined project
Gantz:X is one of four projects announced in the December 2016 issue of Miracle Jump.
The announcement lists a website:  Whether the website is just a teaser or the full Gantz:X project is not quite clear. Once entered, the keywords will display on the top of the page for quick access.
The following keywords forward to websites with small articles in Japanese and English.
- MOVIE, an article on the upcoming Gantz 3DGC movie
- G, an article on the Gantz:G manga
- NEXT, a second article on the upcoming Gantz 3DGC movie
- DB, a database listing characters and tools
- RANK, merely displaying "COMING SOON:", presumably will list highscores from the twitter challenge (see below)
- REPORT, a series of in-universe reports
- CHRONICLE, first report
It is also possible to unlock wallpapers by entering the following keywords and registering via Twitter:
- くろの (says Kurono)
- えっくす (says X)
- きしもと (says Kishimoto)