In both Online and Ad-hoc modes, weapons and armor are automatically restricted (it will be grayed out if not on INFERNO) by level through difficulty -- which means no using high level weapons in an lower difficulty game and HP/armor will be normalized between players. Only on INFERNO are all weapons and full HP/armor allowed (though the restriction can be turned on for a challenge). However, if you achieve 70% completion (weapons and stages; shown on the main screen) for either Storm1 or Pale Wing, the weapon and HP/armor restriction for all difficulties will be selectable (thus be able to be removed/turned on). You will now be able to host a room on any difficulty with all weapons available.