Allie Ducklings are a variant of the Mystery Duck which appear in Mystery Duck Challenges.
- Allie Ducklings are found in some Mystery Duck challenges. A new Mystery Duck challenge appears every 24 hours, but a different type of Mystery Duck will likely feature.
- When a player collects ten Allie Ducklings and completes the challenge, it is added to the Mystery Duck counter (Ten Allie Ducklings counts as one Mystery Duck). For every three Mystery Ducks collected, a new Duckie costume is unlocked.
- Allie Ducklings require one drop of Steam each to collect and fill (ten total). All other Fluids, except Water will kill Allie Ducklings. If one of the ten Allie Ducklings is killed or if the level is completed without them all being collected, the level fails.
- Once all Duckies that are unlocked with the Mystery Duck are unlocked, Mystery Duck challenges will no longer appear, thus, neither will the Allie Duckling.
- While Full, Allie Ducklings take on the appearance of a full Allie Duck albeit much smaller, though with larger eyes compared to its body. Unlike most Allie Ducks, she lacks the purple eyeshadow.
- While Empty, Allie Ducklings have the shape and features as her full version, though in shades of pink.