Diamond/Destiny (YS33, 5)    A non-violent shoot 'em up - what's the point? Rubicon/BugByte (YS21, 5)    Dullish platform variant that's rather like Dan Dare without the Dare. Instructions useful only to clairvoyants. Triaxos/39 Steps (YS21, 6)    More 3D mapping-and-zapping with a couple of neat touches, but mainly it's business as usual. Zynaps/Hewson (YS20, 8)    A good, wholesome shoot 'em up that'll keep you playing but won't knock you for six.