At Microsoft, Newell contributed to the development of early versions of Windows, which formed the foundation for modern PC gaming. This early experience gave him insights into software architecture and user interface design.

Half-Life, Valve's first game, revolutionized storytelling in first-person shooters. The game's immersive atmosphere, seamless narrative, and innovative AI set a new standard for the genre.

The launch of Steam revolutionized digital distribution, making it easier for developers to reach players and for players to access and manage their games. Steam introduced features like automatic updates, modding support, and social networking, which transformed the gaming landscape.

Half-Life 2 showcased groundbreaking graphics, physics, and AI. The game's Source engine became a popular platform for developers, enabling them to create visually stunning and immersive gaming experiences.

Valve's contributions to virtual reality technology have been significant. The Valve Index headset and Half-Life: Alyx demonstrate the potential of VR gaming, pushing the boundaries of immersion and interactivity.

Valve's Steam Deck is a technological achievement as a portable device that can play AAA PC games. It demonstrates innovative hardware and software integration.