Uhhhhhmmmm, am I missing the point of this thread or are others. The point was BUTTONS only. So even a two-way joystick is ruled out, because.....it's a joystick.
i took the liberty of mentioning games that
can be played very well with buttons only. imo, this includes many games with
horizontal 2-way joysticks. i actually think i can get higher scores using "left" and "right" buttons than i can with a "left/right" joystick.
defender, on the other hand, has a
vertical 2-way joystick and is not playable with buttons only.
of course, if the op only wanted to know which games
originally used only buttons, then... never mind!