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An elegant blackjack table in your side panel — full casino rules, splits, doubles, insurance and a leaderboard. Royal 21 Blackjack brings the excitement of a real casino straight to your browser's side panel. Play authentic blackjack with full casino rules, including splitting pairs, doubling down, insurance bets, and natural blackjacks. Challenge yourself to make the best decisions, climb the leaderboard, and become the ultimate card master. 🎲 Features ♠️ Authentic casino blackjack gameplay 🃏 Split pairs and play multiple hands 💰 Double Down and Insurance options 🏆 Global leaderboard to compete with other players 💾 Automatic game progress saving ⚡ Instant play from Chrome's side panel 🎯 Smooth controls and elegant casino-inspired design 🌙 Lightweight, fast, and works offline Whether you're a beginner learning the basics or an experienced blackjack player looking to sharpen your strategy, Royal 21 Blackjack delivers a polished and immersive card game experience without leaving your browser.