For decades, video game enthusiasts and collectors have sought to find titles that represent their passion and fervour for the hobby: games that everyone wants, that no one can find, and that stand tall as the centrepiece of their game room. Enter the "Holy Grails". These are the titles that are untouched in rarity and equally as untouched by the majority of the world.
A website that aims to record the history of videogame innovation is calling on games fanatics for help.
The Game Innovation Database (GIDb), as the website is known, has been developed by a team at Pittsburgh's Carnegie Mellon University. The online encyclopaedia is similar to Wikipedia and allows users to browse and edit the site's content. The developers hope that games fanatics can start to build a complete picture of the last 35 years of games history.