Gemini 4 Carbon builds a LEGO South Park game from one prompt

Robbert van Empel gave Gemini 4 Carbon a single prompt to build a playable South Park game in LEGO style. The result, The Globe of Truth, runs in a browser and scored 86 out of 100 in The Future’s South Park LEGO World benchmark. It placed fifth out of 22 entries when it was assessed. In his video, published on 11 November, Van Empel shows what Carbon built and tries the controls, brick physics and dialogue himself.

The game takes place on a snowy globe covered in studs. You can run and jump around the sphere, visit the school or Tegridy Farms and talk to familiar South Park characters. In the opening gag, Cartman has crushed Kenny under a giant red 2×4 brick. He sends you after two boxes of Cheesy Poofs. That errand and a second search for bricks eventually lead to a laser at Stark’s Pond and another joke about Kenny.

Carbon earned 34 points for visuals, 22 for originality, 19 for interaction and 11 for execution. The landmarks and eight characters give the world a distinct look, but there are long stretches of snow between them. Van Empel encountered collision glitches during the video. You can pick up, rotate, place and throw loose bricks. Connecting bricks is limited to the scripted deliveries. A separate benchmark playthrough reached the finale, and the mobile check found that the stud counter overlaps the quest panel on a narrow screen.

The video also discusses how Carbon compares with other models on broader benchmarks and API costs. The single-prompt game gives viewers a concrete way to judge a different part of its performance. Carbon supplied a world, usable controls and a story you can finish in one attempt. The gaps show up as soon as you try to build freely or look for the next objective. You can play The Globe of Truth and try the same controls shown in the video.