Light Up (Akari) blog

Strategy, history, and guides for Light Up (Akari) fans. New here? Start with how to solve Light Up puzzles, then explore the rest. Prefer to just play? Jump in below.

• How to Solve Light Up (Akari) Puzzles: Strategies and Techniques

  How to solve Light Up (Akari) puzzles: the core techniques — 0-wall and numbered-wall deductions, light-ray exclusion, and lighting the last dark cell — that crack any grid by logic.

• Akari vs Light Up: The Puzzle's Two Names (and the Lamp It Isn't)

  Akari or Light Up? They're two names for the same Nikoli logic puzzle. Here's what 'Akari' means, why it's not the Noguchi lamp or a glowing toy, and how to find the real puzzle.

• Numbered Walls in Akari: How to Solve Light Up From the Clues

  The numbered walls are the heart of every Light Up (Akari) puzzle. Learn what 0, 1, 2, 3 and 4 mean, the corner and edge tricks, and how to solve Akari straight from the clues.

• How to Solve a 5×5 Light Up (Akari) Puzzle, Step by Step

  A complete step-by-step walkthrough of a 5×5 Light Up (Akari) puzzle. Follow every move — 0-walls, the 4-wall, light rays, and the no-conflict check — from the clues to the solved grid.

• What Makes a Light Up (Akari) Puzzle Hard?

  What makes a Light Up (Akari) puzzle hard? Grid size, wall density, how many walls are numbered, and corridor length all play a part. Here's what separates an easy grid from a brutal one.

• The History of Akari: Nikoli's Light Up Puzzle

  The history of Akari (Light Up): how the Japanese publisher Nikoli created this illumination logic puzzle, what its name means, and how it spread to the world as 'Light Up'.

• Is Light Up (Akari) Hard for Computers? The NP-Complete Puzzle

  Light Up (Akari) has famously simple rules — yet it's proven NP-complete, meaning the general puzzle is computationally hard. Here's what that means and why it doesn't stop you solving one.

• How Light Up (Akari) Puzzles Are Made (and Why They Have One Solution)

  How are Light Up (Akari) puzzles made? Inside the construction process: designing the walls, placing the bulbs, deriving the numbered clues, and guaranteeing a single logical solution.