4K (computer virus)
4k is a computer virus which infects COM files and EXE files. The virus was one of the first to employ stealth tactics. Infected systems will hang, after September 22 every year, which is also the date of birth Bilbo Baggins, a character from "The Lord of the Rings". The code was intended to display the message "Frodo Lives", but hangs in all known variants.
Minecraft
"Minecraft 4k" is a simplified version of "Minecraft" similar to the classic version that was developed for the Java 4K game programming contest "in way less than 4 kilobytes". The map itself is finite—composed of 64×64×64 blocks—and the same world is generated every time. Players are restricted to placing or destroying blocks, which consist of grass, dirt, stone, wood, leaves, and brick.