Welcome to Zero21: Solitaire Puzzle, a fresh twist on classic card games that will test your math and logic skills. Your goal is simple: clear the board by playing all the layered cards, but you must keep your running total between 0 and 21. If you drop below zero or go over 21, you bust!
Strategic Gameplay
Navigate overlapping card formations similar to Mahjong or classic Solitaire. You can only play cards that are completely exposed. Plan your moves carefully as you balance positive (blue) and negative (red) cards to maintain the perfect sum.
Powerful Lifelines
Stuck on a difficult level? Use your hard-earned gems in the shop to unlock game-changing power-ups:
Undo: Take back your last move to save your streak.
Discard: Trash an unwanted card from the board.
Hold Slot: Save a tricky card for the perfect moment.
MIN/MAX/MID Cards: Instantly reset your total to stay alive.
Features:
Hundreds of engaging logic puzzle levels.
Daily challenges to test your brain and earn extra rewards.
Beautiful, clean graphics with smooth card-stacking mechanics.
Play offline anytime, anywhere.
Perfect for fans of traditional solitaire, math games, and brain training.
Latest Version
1.0.0Requires Android
7.0
Category
Free Card GameContent Rating
Everyone
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Flag as inappropriateLast updated on Oct 9, 2026
This release includes minor bug fixes and general improvements. Update to the latest version for the best experience.
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