Blue Ocean Zone is a scrapped level that would have appeared in the cancelled video game, Sonic X-treme. This stage was intended to be the underwater level in Sonic X-treme. However, unlike the other Zones, aside from level layout, there is little to no information about this Zone. The level layout is so incomplete, it lacks Badniks and Rings so it is considered more of a test level than anything else. According to Chris Senn, Blue Ocean would be a part of Crystal Frost Zone meaning it was never meant to be its own separate Zone.