Father and Children Use Claude Opus 5.5 to Build Zelda-Style Open-World Game in One Saturday

A father-and-children team has shown a Zelda-style open-world game they say was built in one Saturday with Claude Opus 5.5, with the children designing the world and mechanics. The demo includes two biomes, an island and floating islands, an underground cave, and paintbrush combat in which red triggers fire, blue triggers ice and yellow triggers bounce.