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Swap tiles until every row sums to 15. Play the addictive SumGrids logic puzzle from your browser toolbar. SumGrids — Make Every Row Sum to 15! The most addictive number puzzle game for your browser. Swap tiles on a 3x3 grid until every row totals exactly 15. Simple to learn, surprisingly challenging, and incredibly satisfying! How to Play: You get numbers 1 through 9 on a 3x3 grid. Tap or click any two tiles to swap them. Your goal: Make every row sum to 15. Rows light up bright green when you nail the perfect sum. Limited swaps per level — think fast and plan your moves! Why You'll Love SumGrids: ✅ Pure logic and math brain training ✅ Instant visual feedback with glowing rows ✅ Progressive difficulty — perfect for quick sessions or deep focus ✅ Clean, minimalist design that keeps you in the zone ✅ No ads interrupting gameplay (optional rewarded ads for extra swaps if you get stuck) ✅ Works offline after first load ✅ Perfect for puzzle lovers, math fans, and anyone who enjoys quick brain teasers Whether you have 2 minutes between meetings or want to challenge yourself for high scores, SumGrids delivers that "just one more try" feeling that keeps you coming back. Inspired by classic number puzzles but with a fresh twist — it's like Sudoku meets sliding tiles, but uniquely satisfying. Sharpen your mind, train your logic, and beat your best score. How many levels can you solve under the swap limit? Play SumGrids now — completely free!