Collect 21
Relaxing Number Game
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Archived App (Last seen on 8 Jul 2026)
This is an archived listing of the app previously available on the App Store.Although the app is no longer distributed by Apple, you can still view its description, screenshots, version history, ratings, and metadata for reference.
About
Playing Collect 21 for 10 minutes a day sharpens your mind and prepares you for your daily life and challenges!
Collect numbers - Challenge your brain through thousands of mahjong puzzles. Puzzles start with low difficulty and become challenging fast!
Create a Calm Experience - Solve addictive yet always evolving numbers by collecting mahjong puzzles in a unique and calm experience.
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What's New in Collect 21
1.0
August 2, 2022
