The utility of different Cookies in this rarity vary greatly; some can outperform Epic Cookies in certain roles, while others can be less effective than even Common Cookies. For new players, Rare Cookies will do the job of substituting for missing roles as they clear through World Exploration stages, as well as the early tiers of Kingdom Arena. While players are expected to use replace them with Epic Cookies over time, higher Trays in the Tower of Sweet Chaos will restrict the number of higher-rarity Cookies that a team can use, thus making at least a few leveled Rare Cookies essential for progressing further in that mode. Thus, investing Toppings and Skill Powder in them can generally be worthwhile.
Each Rare Cookie's Soulstone can be farmed from multiple stages in Dark Mode, making them easier to max out than higher-rarity Cookies.