What's the difference between Shikaku and Nonogram?

Shikaku uses numbers inside the grid to define rectangle areas. Nonogram uses numbers outside the grid to define row/column fill patterns. Shikaku is about area partitioning; Nonogram is about pixel art revelation.

Which is easier, Shikaku or Nonogram?

Shikaku is generally easier to learn — the rules are simpler (draw rectangles, area = number). Nonograms have more complex deduction chains and can be very frustrating when you make a mistake. Small Shikaku puzzles (5×5) are great for beginners.

Is Shikaku like Nonogram?

They're both grid-based logic puzzles, but the mechanics are completely different. Shikaku is spatial (draw rectangles); Nonogram is sequential (fill rows/columns based on clue numbers). They test different types of logical thinking.

Shikaku vs Nonogram — Grid Puzzles Compared

Both are popular grid-based logic puzzles, but they work in fundamentally different ways. Shikaku is about drawing rectangles; Nonogram is about revealing pixel art. Here's how they compare.

The Core Difference

Shikaku: Numbers are INSIDE the grid. Each number defines the area of a rectangle you must draw around it. Fill the entire grid with non-overlapping rectangles.

Nonogram: Numbers are OUTSIDE the grid. Row and column clues tell you how many consecutive cells to fill. The result is a pixel art picture.

Feature Comparison

Feature	Shikaku	Nonogram
Core Mechanic	Rectangle area partitioning	Row/column fill patterns
Number Location	Inside grid cells	Outside grid (row/column headers)
Number Meaning	Area of surrounding rectangle	Count of consecutive filled cells
Output	Colored rectangle partition	Black-and-white pixel art
Typical Grid	5×5 to 10×10	5×5 to 50×50
Solve Time	5-30 min	10-120 min
Beginner Friendly	Yes — 2 rules to learn	Moderate — more deduction types
Mistake Recovery	Easy — erase and redraw	Hard — errors cascade
Visual Reward	Immediate (colored grid)	Delayed (picture reveals at end)
Online Play	MeowBlock (free, unlimited)	Many free options exist

Solving Techniques Compared

Shikaku Techniques

Factor decomposition — break numbers into width × height pairs
Corner-first approach — corners have fewer valid orientations
Area arithmetic — all areas must sum to total grid cells
Spatial reasoning — visualize rectangle shapes in the grid

Nonogram Techniques

Overlap marking — find cells that must be filled in all possible positions
Edge anchoring — clues that touch grid edges have fewer placements
Cross-referencing — use row fills to constrain column possibilities
Gap analysis — identify mandatory empty cells between groups

Which Should You Play?

🐱 Choose Shikaku if you...

Prefer spatial/geometric thinking over sequential deduction
Want quick puzzles you can finish in one sitting
Like immediate visual feedback as rectangles fill in
Are new to logic puzzles and want simple rules
Enjoy area estimation and shape visualization

🎨 Choose Nonogram if you...

Enjoy pixel art and picture-reveal mechanics
Prefer systematic deduction over spatial reasoning
Want longer, meditative sessions
Like progressive difficulty from 5×5 to 50×50
Enjoy the satisfaction of a complete picture at the end

Can I Play Both?

Definitely! They exercise different parts of your brain. Shikaku is great for quick spatial warm-ups; Nonogram is perfect for longer, focused sessions. Many puzzle lovers alternate between them.

Try Shikaku on MeowBlock

Curious about the rectangle side? MeowBlock offers free Shikaku puzzles from 5×5 to 10×10, with cat visuals, daily challenges, and an online solver.

▶ Play Shikaku Free on MeowBlock

Related Comparisons

Shikaku vs Nurikabe — another Nikoli classic compared
MeowBlock vs Classic Shikaku — online vs Nikoli original
Rectangle Partition Guide — deep dive into the genre