"Grand Theft Auto III" is considered to be the first 3D game in the series, using Criterion Games' RenderWare game engine. When designing the game, the development team expanded upon concepts introduced in the previous "Grand Theft Auto" games. Benzies stated that the intention was to recreate the "freedom and diversity" of the previous games in a "living, breathing 3D world", using the power of the PlayStation 2 to do so. The console's ability to use DVDs, an improvement over the PlayStation's limit to CDs, allowed the team to store more data, such as animations, music and environments. Despite this, the team found it difficult to fit the game into the PlayStation 2's 32 megabytes of RAM, due to the scale. The game's size also created difficulties for the testers, due to the variety of options. Benzies felt that creating a living city was the "underlying principle" of the game's concept during development. Executive producer Sam Houser felt that the game's 3D element allowed the "chemistry of the team come together perfectly for the first time".