Mini-Moldorms first appear in the Tower of Hera, where the boss is a full-sized Moldorm. They are vulnerable everywhere, as opposed to the boss Moldorm only having a weak spot on its tail. These miniature enemies move around in a random pattern, bouncing off any objects they come in contact with and not pursuing Link as some other enemies do. In the Skull Woods, they appear to be guarding its great treasure. They do one heart of damage to Link while he is wearing Green Mail.
Mini-Moldorms look and act identical to their Link's Awakening appearance.
In Oracle of Seasons, a Mini-Moldorm appears as the guardian of the X-Shaped Jewel. A sign reads, "Here lies the Black Beast", and upon using a Mystery Seed on the question mark-shaped patch of earth, a Mini-Moldorm rises. Upon its defeat, a Treasure Chest appears containing the X-Shaped Jewel, necessary to enter Tarm Ruins.
Mini-Moldorms act the same as in A Link to the Past. The orange variation is in Death Mountain cavern and the Tower of Hera, while the purple variation is in the Skull Woods. The purple variation is much more difficult to defeat, has more power, and is not as common as the orange variation.