One person's silly idea is another person's inspiration.
This movie is essentially constructed by taking one controller and wiring it into two SNES emulators at once. The same input is used to play both games to completion. In other words, the player plays two games simultaneously with one controller.
Note: There is a visual anomaly during the battle with Serges in X2. This is an emulator bug relating to the Cx4 chip used in the Mega Man X2 cartridge.
If you like this movie, be sure to check out the movie that even beats four games with one controller!