Dev rewrites GTA 3 source code to reveal what Rockstar was hiding and show how Liberty City fit on a PS2

Grand Theft Auto 3 was not the first open-world game, but it laid a blueprint that the industry is, in many ways, still following to this day. Urban environments at the scale of Liberty City were practically unheard of when GTA 3 hit PS2, but Rockstar North – then known as DMA Design – managed to squeeze it all inside some impressively tiny memory constraints. Now, a dev has rewritten the game's source code to demonstrate how it all works.The PS2 has just 32MB of memory to work with,