Over the last two decades, getting id Software's 1993 classic FPS to run on devices that were never intended to play games has become a popular hobby among modders and tinkerers.
PDF files support JavaScript, and this is used by most modern browsers to display PDFs. Ading2210 took advantage of this and used ASCII characters to create the visuals you see when playing Doom's PDF port.
Id Software released Doom's source code in 1997-just four years after the game's explosive debut. Since then, fans have spent the past 25+ years creating 'source ports' of the shooter.
Thanks to that source code release decades ago, fans have been able to port Doom to basically anything, making it a unique and enduring phenomenon in gaming culture.
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