
Demoneye-X © 1981 Irem Corp.
Fearsome Unknown Creatures Close In. Now, A New Terror Spreads Out Across The Universe !! The player moves his spaceship to the right and left with the control lever and fires missiles by pressing the Fire button. When the space demons are attacked they change their shapes and fire missiles. The player must avoid their attacks and retaliate with his own missiles. When all the small demons have been shot down and the super-demon is hit in the heart, the screen is cleared.

Irem M-27 hardware (contains 4 boards, the main M-27M-C board, the sound board, a M-27sb sub board and a M-42-S board full of 2114's).
Main CPU : MOS Technology M6502 (@ 5.865 Mhz)
Sound CPU : M6802 (@ 3.579545 Mhz)
Sound Chips : (2x) General Instrument AY8910 (@ 3.579545 Mhz)
Players : 2
Control : 2-way joystick
Buttons : 1
Released in November 1981.

| Demoneye-Jr | 40 Points |
| Octoplus | 70 Points |
| Neo Octoplus | 100 Points |
| Neo Demoneye-Jr | 100 Points |
| Octobomb | 100 Points |
| Octobomb Formation | 200, 400, 800 Points |
| Demoneye-X | 500 Points |
| Demoneye-King | 1500 Points |