Master Akari logic with strategies for every skill level — from your first puzzle to expert grids.
Whether you are picking up your first light up puzzle or you have been solving Akari for years, the right strategy makes all the difference. This guide breaks down techniques by skill level — beginner, intermediate, and advanced — so you always know what to try next.
Prefer to learn by doing? Play free on MeowTrail and apply each strategy as you go.
These are the first techniques every light up puzzle solver should master. They handle most of the grid on easy and medium puzzles.
Corner cells are the easiest to reason about because they have only two neighbors. If a corner cell needs to be lit and one of its two neighbors is blocked by a wall, the other neighbor must contain a bulb. This is the most basic Akari strategy and a great starting point for beginners.
Example: In the top-left corner, if the cell below the corner is a black wall, the cell to the right must hold a bulb to light the corner. Place it immediately.
When you see a black cell marked 4, it has exactly four orthogonal neighbors — and all four must be bulbs. This is the most powerful forced placement in any light up puzzle. Place them right away, then mark all the cells they illuminate.
Pro tip: A "2" in a corner (which only has 2 neighbors) is just as decisive — both neighbors must be bulbs.
A black cell marked 0 means none of its adjacent white cells can hold a bulb. Mark all four neighbors with an X. Every X you place reduces the grid's possibilities and often cascades into forced placements on nearby numbered cells.
Why it matters: If a "3" cell now has three of its four neighbors marked X, the remaining neighbor must be a bulb — even if that was not obvious at first glance.
Once you have mastered the basics, these techniques will help you solve medium and hard puzzles without guessing.
This is the core mechanic that makes Akari unique. Every bulb illuminates all white cells in its row and column until a black wall blocks the beam. This has two consequences:
After every bulb placement, trace its beams and update your strategy. This single technique resolves more cells than any other.
Cells along the grid edge have only three neighbors (instead of four for interior cells). This makes edge constraints tighter. If an edge cell is dark and only one direction can light it, that direction is forced.
Look for: Edge cells sandwiched between two black walls. They can only be lit from one direction — the bulb is forced.
After you have placed some bulbs and marked X's, re-check every numbered cell. If a "2" cell has two neighbors already occupied by bulbs and two neighbors marked X, the constraint is satisfied and you can stop worrying about it. But if a "2" cell has one neighbor already a bulb and one neighbor marked X, the remaining two open neighbors must contain exactly one bulb — not both, not zero.
This counting strategy is the bread and butter of intermediate Light Up puzzle solving.
For hard and expert puzzles, you need techniques that reason about multiple cells at once. These strategies will help you crack the toughest Akari grids.
If a white cell can only be lit by one specific neighbor (because walls block all other directions), that neighbor must contain a bulb. This is especially powerful in narrow corridors between walls where lighting options are severely limited.
Application: Scan the grid for dark cells that have exactly one path of illumination remaining. Any cell that passes through only one candidate bulb position forces that position.
When two or more dark cells can only be lit from the same single cell, that cell is a forced bulb. This is a pattern recognition strategy: look for clusters of dark cells that funnel down to one candidate position.
If that single position fails to light all of them, you have a contradiction — meaning the assumption that led to all those dark cells was wrong.
When direct techniques are not enough, use elimination — a formal proof-by-contradiction method:
This is not guessing — it is formal logic. Choose cells adjacent to numbered walls for the fastest contradiction detection.
Chain reasoning links multiple techniques together. Place one bulb, trace its line-of-sight, update numbered cells, find a forced placement, place another bulb, repeat. A single chain can resolve 10-20 cells in sequence.
Master tip: On hard light up puzzle grids, look for the cell with the most constraints (surrounded by numbered walls) and start your chain there. The chain will propagate faster because each numbered wall provides immediate feedback on whether your placements are correct.
Even experienced solvers make these errors. Watch for them as you work through any Akari puzzle:
Start with numbered cells: place bulbs next to every "4" cell (all 4 neighbors must be bulbs), and mark X's around every "0" cell (no neighbors can be bulbs). This gives you the most forced placements immediately. Then scan for corner cells that can only be lit from one direction. These two strategies alone will resolve 30-50% of most grids.
Every bulb illuminates all white cells in its row and column until blocked by a black wall. Cells that are already lit cannot hold another bulb. If a white cell is not yet lit, at least one bulb must be placed within its line-of-sight. This bidirectional constraint is the heart of Light Up puzzle logic.
The elimination technique is a proof-by-contradiction method: assume a cell has a bulb, follow the logical consequences, and if a contradiction appears (like a numbered cell exceeding its count), the assumption was wrong and the cell must be empty. This is a legitimate and sometimes necessary strategy for the hardest grids.
No — the same strategies work on all grid sizes. What changes is how often you use each one. Small grids (5×5 to 7×7) mostly need beginner techniques. Medium grids (10×10) require intermediate techniques like line-of-sight elimination. Large grids (14×14 and above) may need the full advanced toolkit including elimination and chain reasoning.
Chain reasoning is the most challenging because it requires holding multiple logical steps in your head. Start by practicing on medium puzzles where chains are short (2-3 steps), then gradually work up to hard puzzles where chains can be 10+ steps long. The MeowTrail solver can help you verify your chain reasoning.
