Purple sweets are a stackable food item that are earned from all levels of treasure trails. Purple sweets are the only stackable food item in the game, restoring 1-3 hitpoints and 10% run energy per sweets eaten.
Purple sweets are commonly used by players aiming to get a Fire Cape from defeating TzTok-Jad since one stack is nearly an infinite source of healing. It is also often used by players going for an endurance record attempt at bosses.
Since purple sweets can stack, they heal more hitpoints per inventory slot than any other item, limited only by the amount of purple sweets the player has and the 2,147,483,647 limit of items that a stack can contain. 2,147,483,647 purple sweets means you can heal up to 6,442,450,941 hitpoints. It would also require 4,054,449,125,536 coins to purchase the maximum stack of sweets.