Like us on Facebook, follow us on Twitter! Celebrate another year with MH and read our yearbook.
Manga News: Check out this week's new manga (7/7/14 - 7/13/14).
Forum News: Visit new sections for Nisekoi and Kingdom!
According to the insufferable marketing copy that I'm forced to read on the title page of every chapter:
Gantz Mobile Mission is the "cellular game version" of Gantz/MINUS.
Gantz/BURST is a new cellular game where "The protagonist is you!" So I'm guessing it's just playing through the story as if you're a person trapped in the room.