Fill Rule Grid

Welcome to Fill Rule Grid, where pure deduction meets minimalist puzzle design. Each level presents you with an empty 4x4 grid and a distinct set of conditional rules. Your objective is entirely calculated: place the correct geometric symbols into the cells to satisfy every active rule simultaneously. There is no guesswork, randomness, or luck involved—only absolute logic and structural reasoning.

Key Features & Mechanics:
Pure Deductive Grid Gameplay: Solve engaging puzzles on an elegant 4x4 board. Analyze rows and columns to deduce the exact coordinates of every symbol, completing challenges strictly through step-by-step logic.

Diverse Rule Types: Navigate an array of structural constraints that govern the grid. Master core rules including Exact Count (e.g., exactly two matching symbols in a row), No Adjacent Duplicates, All Unique lines, Must Contain indicators, and Max Count limits.

Progressive Difficulty Packs: Train your brain across separate skill-building tiers. Advance sequentially through curated Beginner, Intermediate, and Expert level packs, or sharpen your daily streak by solving the unique Daily Puzzle.

Essential Bench Tools: Streamline your darkroom-style puzzle solving using intuitive action controls. Use Notes mode to map out possibilities, Erase to clear misplaced objects, Check to immediately validate active rules, and Smart Hints to get unstuck on complex grids.

Quick Sessions, Real Progress: Enjoy casual 2-minute puzzles perfect for mental exercises on the go. Rest easy knowing your current board state is protected by robust Auto-save functionality.

Analytical Stat Ledger: Monitor your long-term cognitive growth. Keep a record of your total puzzles Solved, track your active Daily Streak, and log your Best execution times across all difficulty categories.

Tailored Layout Adjustments: Personalize your puzzle interface within the settings screen. Toggle floating particles and motion effects on or off, or activate the dedicated Left-Handed Layout to move the symbol tray for optimal accessibility.