Die Hard (NES)

Being based on a blockbuster action flick, developed by Pack-In-Video, published by Activision, and released on the NES, you might assume that Die Hard is a frustrating and mediocre game.

You would be correct.

Speedup Time
During the game, press Start to open the status screen, where the time is stopped. Press A + B + Select to run and speed up the time. This will lead to increasing the locks counters, then setting the final time to leave the building. If you skip all this time, the game ends.

Hidden Continue
Immediately after you die, but before the screen fades out, hold Down + A + B + Start. After the game over screen, the continue screen will appear...although you'll have a mere two continues.

Picture Test
Hold Up + Left + Select at the difficulty selection screen, before starting a new game. Press A, and before the game starts you'll see all the in-game splash screens with the same text:

Theo: "Lock one is down, Hans! I estimate about a half hour to go!"

The Japanese version shows all the in-game messages before the game screens.