Boom 21 - Card Puzzle

A calm card puzzle with an explosive heart. Climb the levels from 17+ to the FINAL 21 - plan each card, master the fuses, and earn every explosion.

Every column is a stick of dynamite.

Boom 21 is a calm, turn-based card puzzle with an explosive heart. Drop playing cards into columns and stack them toward exactly 21 - hit it, and the column erupts in gold. Go over, and it burns. Every card is a decision.

HOW IT PLAYS Cards fall one at a time from a fairly shuffled deck. Tap a column to place each card. When a column's total reaches the threshold, its fuse ignites and starts burning down — leave it alone and it explodes on its own, scoring what it holds. Or take the risk: keep adding cards, push the total toward a perfect 21, and earn double. But one card too many and the column busts, costing you a life.

CLIMB THE LEVELS Fill the progress bar with explosions to raise the threshold: 17+, then 18+, 19+, 20+ — each level narrows your target and sharpens every choice. Reach the end and face the FINAL 21, where only perfection counts and every perfect 21 restores a life. How far can you climb?

FAIR BY DESIGN No timers. No pressure. No rigged draws. Boom 21 deals from an honest 52-card shuffled deck — the same odds as a real deck of cards, always. See the next cards coming and plan ahead. When you lose, it's a lesson; when you win, it's yours.

FEATURES

• Calm, turn-based play — think as long as you like
• A fair 52-card shuffled deck, never stacked against you
• Rising threshold levels and the FINAL 21 endgame
• Explosive celebrations: chains, perfect 21s, and level-up confetti
• Your run is saved automatically — pick up right where you left off
• Run history and personal records
• Plays fully offline, anywhere
• Available in 8 languages
• No ads, no account, no data collected

One rule. Endless depth. Make 21 — and boom.