Have the game solve the puzzle for you. 8 frames faster than solving it yourself, but it's cheating. No ending plays after this.
This is fast because the Game menu at the top, like many Win3.11 menus, has keyboard shortcuts for specific choices, with the shortcut letter underlined. In the Game menu, High Scores has the S key as a shortcut and Solve has V. For TetraVex at least, you need to have the menu open already to be able to press them.
Needs this verification input played back first.