TetraVex is a puzzle game for the Windows 3.1 system, which was a part of Best of Microsoft Entertainment Pack (or Best of Windows Entertainment Pack at that time). The goal of this game is to match tiles onto a grid to make the border numbers match. Grid size, digits and game timer can be customized in the game.

CoolKirby solves the 2x2 puzzle of the game as fast as possible, by buffering the inputs while the game loads.