Crackline: Vault Heist Puzzle

Crackline is a code-breaking heist puzzle. Every round, you play both sides of the vault door. BUILD YOUR VAULT Pick a secret code of 4 symbols from 6 shapes. Repeats are allowed. Then hide up to 2 traps: an attacker can't see them, but every wrong guess on a trapped slot burns an extra guess. WATCH THE AI TRY An AI safecracker gets 8 guesses to break into the vault you just built. Watch every attempt play out, and see your traps spring. Hold it off and you earn a defense bonus. CRACK A RIVAL VAULT Now it's your turn. You get 8 guesses to open a rival vault. After each guess, every symbol gets a ring: - Solid green: right symbol, right spot - Dashed yellow: in the code, wrong spot - Gray: not in the code Watch out, rival vaults can be trapped too. CLAIM THE HAUL Crack a vault in fewer guesses to earn more coins. Your defense rate, vaults cracked, average guesses per crack and coin total are saved on your phone. WHY YOU'LL KEEP PLAYING - Quick rounds, perfect for a few minutes - Easy to learn, with real strategy in where you place traps - Shapes and colors are both distinct, so the symbols read clearly for colorblind players - Plays fully offline - No ads, no purchases, no account, no data collected