Passage: A Hat in Time is a platform action-adventure game set in an open world environment and played from a third-person perspective. The gameplay style has been described by several editors to be similar to Nintendo 64 platformers such as Super Mario 64 and Banjo-Kazooie. The player travels between four open levels, which can be freely explored without time limits. The player can collect various items, solve puzzles, and use an umbrella to combat enemies. The primary objective is to collect "Time Pieces", 40 of which can be found in the game, which unlock additional levels as more are collected. After being defeated, the enemies drop "Pons", currency that can be used to unlock additional challenges and purchase badges that increase Hat Kid's abilities. The player can collect Yarn Balls in each level, which can be stitched into new hats to wear. Each hat grants Hat Kid a different ability, such as a faster sprint or brewing explosive potions. Other collectibles include "Relics", which can be used to unlock "Time Rift" bonus levels, and "Rift Tokens", which can be exchanged at a machine for bonus materials such as music remixes and additional cosmetics. Initial actions taken earlier in the game have an effect on later levels, as the main character revisits each area several times before the game is finished.

Question: What are other collectibles besides Yarn Balls?
Relics