Below is a comprehensive guide to finding all hidden mementos in Gris. It details the locations, specific requirements, and the abilities needed to access them throughout the various chapters of the game.

Chapter 1: The Awakening
– Memento 1: As you pursue the third firefly, opt to drop left instead of climbing the tower. This will lead you to your first memento.
– Memento 2: This memento cannot be obtained until later in the game after acquiring the Dive ability. Once you unlock the yellow area, head back to the hub and swim to the left to retrieve the memento submerged in the water.

Chapter 2: The Forest
– Memento 1: Progress through the area until you reach a sequence of disappearing trees. Utilize timed jumps to ascend to the top of one of these trees, where the memento awaits.
– Additional Mementos: While exploring this chapter, pay attention to hidden pathways and platforms. Using the singing ability can help you access secret areas that might contain more mementos.

Chapter with the Red Birds
– Memento: Ascend to the pinnacle of the vanishing buildings. When they disappear, wait for the red birds to help you reach the upper platforms where you can find this memento.

Chapter with Upside-Down Flowers
– Memento 1: After acquiring the singing ability, sing to the upside-down flowers to interact with them. Then, use the red birds to navigate the vanishing platforms, leading you to a hidden memento.
– Memento 2: Before engaging with the puzzle featuring three giant upside-down flowers, drop down to snag this memento by canceling your flap with a glide jump.

Chapter with the Statue
– Memento: During the bird sequence in this chapter, let the bird scream at you. This will enable you to float across to a specific area where you can collect the memento.

General Tips for Memento Hunting
– Thorough Exploration: Each memento is often hidden behind a need for exploration. Take your time to traverse different paths and try every ability at your disposal.
– Smart Usage of Abilities: Make good use of your abilities like singing and interacting with red birds to uncover hidden paths. These abilities are essential for accessing areas that hold mementos.
– Revisit Previous Areas: Certain mementos can only be accessed after you have obtained new abilities. Don’t hesitate to return to earlier stages of the game for those hidden items.

Additional Resource
For those who prefer visual guidance, consider consulting a detailed video walkthrough. This can help clarify the precise actions needed to acquire some of the more elusive mementos. Good luck on your journey to collect all the mementos in Gris!