In 'Hello, Goodbye!', players step into the whimsical shoes of Sam, a regular human whose life takes a bizarre turn when they discover that every 'hello' spoken can conjure an alternate reality. As Sam, you navigate a kaleidoscope of absurd scenarios driven by interaction with quirky characters (like a talking sandwich and a philosophical cactus) and absurd challenges. Your mission is to uncover the bizarre reason behind your newfound powers while juggling various versions of friends, foes, and even your own pets across parallel dimensions.