Chiller

Chiller is a toned-down, unlicensed port of an incredibly-violent light-gun arcade game.

CRC Test
The European version contains some hidden copyrights and a test screen accessible by holding Up + A + Select and pressing Reset. This screen will show you whether you're using a PAL or NTSC console, along with a PRG checksum and a version build date (September 21, 1990).

The US version has no such routines or text; however, among the normal game's strings, there are three unused pieces of text: "BY", "CHRISTOPHER", "ERHARDT".