"Destroyed Hapeville" stage, which is unlocked by defeating Super Tac in Story Mode in Zero Hour. This stage plays a suspenseful remix of track 111 from 3D Parkour Pro.
@James BB3DS was the very first Bloodstreams Battles game for SmileBASIC released on February 2016, which lacked Flag and had Fazbear instead. It had a demo and 3 updates before the game was pulled from servers.
To veteran BB3DS players:
If Freddy Fazbear was one of your most hyped characters to try in BB3DS before it came out, I regret to say that in Zero Hour, he is replaced with Flag.
The good ol' Pit 1 stage in BB3DS redone for Zero Hour. And the good thing for interested BB3DS players is, Cyborg Ninja can't interrupt matches here - since he is not in Zero Hour.
Upcoming stage from 3D Parkour Pro to represent how "the protagonist of this game" got in Bloodstreams Battles: Zero Hour. A good way to prepare yourself for Zero Hour for its fans out there!