The VMX is a pocket handheld shaped like an original Xbox Memory Unit: a 64 × 64 one-bit picture on a green OLED, a D-pad, A and B, and a beeper. Press any button to switch it on.
Menus: A opens, B goes back. Games: left/right picks, A plays, Down shows a demo. In a game, the side button (the small strip on the right edge) goes back to the games; so does B in games that don't use it. Hold the side button to switch off and on. Left alone in the menus, the games play themselves.
↑↓←→ D-pad Z/Space A X B Esc side button. Pads work too.
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