Traceline: One Line Logic Puzzle Game

Draw one line through every checkpoint and fill the whole grid. Three sizes, a daily puzzle, works offline.

Traceline is a clean, focused one-line logic puzzle. Start at checkpoint 1, trace a single continuous path through every numbered checkpoint in order, and fill every cell in the grid before you reach the last number. The line can't cross a wall, and it can't cross or touch itself. Simple to learn, satisfying to finish. HOW IT WORKS Drag to draw the line, or tap an adjacent cell to extend it one step at a time. Changed your mind? Drag backwards to retract, or tap any cell already on the path to jump back to that point. Undo and redo are always available. WHAT'S INSIDE - Three grid sizes — 5x5 for a quick trace, 6x6 for a few minutes, 8x8 for a longer route - A daily puzzle — a fresh grid every day, with a streak counter to keep it going - Personal records — your fastest time at each size, puzzles solved, and puzzles solved without hints - Hints — three per puzzle when you want a nudge, and a badge when you finish without using any - Light and dark themes, with your choice remembered - Full-screen mode for a bigger board - Keyboard play — arrow keys to draw, plus shortcuts for undo, hints, and pause PRIVACY Traceline works entirely offline. There are no accounts, no sign-up, and no data collection. Your puzzles, times, and streak are saved locally on your device using Chrome's storage, and nothing is ever sent anywhere. Every puzzle is generated on your device and checked to have exactly one solution.