Sharpen your mind with a fill-the-block-style one-stroke line brain training puzzle game. A simple but addictive fill one stroke line block puzzle game that’s completely free to play. HOW TO PLAY Just fill in all of the blocks using only one stroke line. FEATURES - NO WIFI?NO PROBLEM,Enjoy puzzle anytime, anywhere - FREE TO PLAY & Suitable for all ages - NO penalties & time limits - You can enjoy Drag & Fill block puzzle at your own place Use hints for puzzles that are too hard to solve. Hints are also free, of course. It's great for time filling and always keeps the brain working. The puzzles in this one line stroke game can be hard or easy, but each one takes careful planning. Your brain becomes more active the more you play. During your commute, before you sleep… enjoy downtime with brain training.