Tree sap

Tree sap, or simply sap, is a gelatinous substance found in the Tree Zone in Super Mario Land 2: 6 Golden Coins. Mario can use it to get across spikes by jumping inside and "swimming" through it to a safe area. It only appears in the Tree Zone's second level, where it is on almost every wall and fills the small gaps between floors. Moofish swim inside it, adding to the difficulty of traversing it.