 With the rise of proprietary software in the mid to late 1980s, games became more and more proprietary.However, this also led to the first deliberately free games such as "GNU Chess" of the GNU Project, part of whose goal is to create a complete free software system, games included.More advanced free gaming projects emerged, such as "NetHack" and "Netrek", many still developed and played today in front-ends such as "Vulture's Eye".