Laser Invasion is an NES game by Konami built around a wacky headset controller. Don't worry – it can also be played with a controller or Zapper.
As with most games Konami has published since 1990, this game features a form of copy-protection. When booting, the game checks for the presence and integrity of a CHR bank with copyright tiles; part of the copyright message screen contains the string "(c) KONAMI 1991", and the copy-protection routines check for that string.
If the test fails, the Japanese version turns on "Hard Mode", where one direct hit kills you instantly. Strangely, the US version does all the same checks and sets the same flag...but has none of the effects.