X-Men: Children of the Atom (Japan 941219)
X-Men: Children of the Atom (Euro 950105 Phoenix Edition) (bootleg)
X-Men: Children of the Atom (Hispanic 950331)
X-Men: Children of the Atom (Asia 941217)
X-Men: Children of the Atom (Japan 950105)
X-Men: Children of the Atom (Euro 950105)
X-Men: Children of the Atom (Euro 950331)
X-Men: Children of the Atom (USA 950105)
X-Plan (Ver. 101)
X-s (Bwb) (MPU4) (set 7)
X-s (Bwb) (MPU4) (set 6)
X-s (Bwb) (MPU4) (set 4)
X-s (Bwb) (MPU4) (set 2)
X-s (Bwb) (MPU4) (set 5)
X-s (Bwb) (MPU4) (set 3)
X-s (Bwb) (MPU4) (set 1)
X-tra X-tra (Maygay) (EPOCH) (1.5, set 1)
X-tra X-tra (Maygay) (EPOCH) (1.5, set 2)
X-Train (Ver. 1.3)
X-treme (Bwb) (MPU4) (set 2)
X-treme (Bwb) (MPU4) (set 3)
X-treme (Bwb) (MPU4) (set 1)
X'eye (USA, NTSC)
X's & O's
X1 (CZ-800C)
X1 Turbo (CZ-850C)
X1 Turbo (CZ-862C)
X2222 (5-level prototype)
X2222 (final debug?)
X68000