AI aficionado CozyBlaze carried out an experiment in which he employed OpenAI's latest cutting-edge model, GPT-6 Astra, along with MCP and a customized SourcePauseTool, to successfully empower the model to autonomously finish the 3D puzzle game 'Portal'. During the entire process of completing the game, the model made a grand total of 3,336 tool calls. The experimental expenses were borne by CozyBlaze's Codex Pro subscription service. When the model was in the thinking phase, the game would enter a paused state, and the system would supply it with crucial information, such as game screenshots and the positions of characters. It took roughly 24 hours for GPT-6 Astra to fully progress through the game from start to finish. Meanwhile, the edited video of this accomplishment is around 2 hours in length. CozyBlaze holds the view that this achievement stands as a groundbreaking demonstration of multimodal AI intelligence. Although there are still some challenges to be overcome, this experiment is steadily transforming OpenAI's 2016 vision—to develop a single AI agent capable of tackling diverse game tasks—into a tangible reality. It's noteworthy that GPT-6 Astra, which was launched this month, has attained the current state-of-the-art level in multiple domains, including computer operation and web browsing.