OXM UK writes: " producer of the Soul Calibur XBLA port, Robert Johnson, has explained why it's missing the original's mission mode and doesn't have online play.
Despite being a port of the Dreamcast version, its mission mode isn't included in the Xbox Live Arcade version. Johnson explains why.
"We started this project with the full intention of hitting the 150MB size limitation as required by Microsoft," he says. "However, the original game was much larger so we did have to make one major adjustment, and that was to remove the Mission Battle Mode... it wasn't until the end of the project that file size limitations were no longer an issue, but at that point it was too late to put Mission Battle Mode back in."
He also reveals why the decision was made not to include online play for Soul Calibur."