The book calls it the Gray World: anhedonia, when joy goes flat too. We are going to bring the color back, one Joy List pick at a time.
How to play: tap or click the floating Joy List bubbles. Each one fills its happiness chemicals. Fill all four meters to clear a stage. Balance matters: we want options for all four.
Gray fog bubbles drift by too. Tap them to clear the fog. Keyboard: arrow keys to pick a bubble, Enter to collect.
Make your own Joy List: it's in the book.
If the gray turns to black, call 988 (US/Canada). You don't have to navigate the darkness alone.