^There's no actual hyphen in any of the logos. However, there is mention of an "X-ZONE" in the game script, though it could be said that this is only to match with all the other X-<something> puns throughout that script. If so, the name is either "XZONE" (commonly depicted; see also XMultiply), or simply "X ZONE".
^"X-Zone". Mobygames. 1992. Retrieved 16 March 2014.