TopTop, part of Chizicheng Technology, and Viggle have launched Slap Showdown, an AI-powered 3D social game that uses Viggle’s JST-2 world model. Players can upload a photo to create a personalized 3D character for battles, and the game is reportedly available across multiple global markets. 36Kr also reported that JST-2 received a full rollout on October 19, generating 3D characters, actions, and scenes through one unified model; Viggle characterized the launch as a “GPT-2 moment” for world models.