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About Cards 21
Cards 21 crosses solitaire's layout with blackjack's arithmetic. You place cards into columns, and a column clears when it totals exactly 21 — but a column that goes over is stuck there, taking up space you need.
It's a genuinely clever combination: solitaire's question of where a card goes, answered with blackjack's maths. Planning two or three cards ahead is what separates a good run from a quick one.
How to play Cards 21
- Place a card
- Drag and drop into a column
- Touch
- Tap the column
- Cards arrive one at a time; place each into a column.
- A column totalling exactly 21 clears and scores.
- A column over 21 is stuck and blocks that space.
- Play until you run out of space or cards.
Cards 21 tips
- Keep one column low as a dumping ground for high cards.
- Count what's left before committing a column to a specific total.
- Aces and face cards are the flexible pieces — save them for finishing columns.
- Never push a column to 19 or 20 unless you know a small card is coming.
Cards 21 — questions
How does Cards 21 work?
Place incoming cards into columns; a column that totals exactly 21 clears and scores, while one that exceeds 21 is stuck and blocks that space for the rest of the game.
Is it luck or skill?
Both — the cards are random but where you place them is entirely your decision, and keeping flexible columns open is what makes long runs possible.
Does it work on a phone?
Yes — tap or drag to place cards. Nothing to install.
- Categories
- Puzzle
- Platform
- Web browser — desktop, mobile, and Chromebook
- Cost
- Free, no download or sign-up