I Transmigrated Across Myriad Worlds and Turned Myself In

The protagonist transmigrates to a parallel world and awakens the Myriad Worlds Transmigration System. He must complete a mission in each world before he can return. Since he is a couch potato, he decisively turns himself over to the government and lets them handle his missions, while he takes it easy and casually tells them what he knows about each world. The worlds are all from his previous life: cultivation worlds and horror movies.