Shikaku - Brain Workout

Shikaku - Brain Workout

Brain Puzzle Games

1K ratings
13 reviews
Free
In-App PurchasesWith Ads

Details

  • Released
  • Updated
  • May 26, 2026
  • July 21, 2026

Features

Shikaku - Brain Workout screenshot #1 for iPhone
Shikaku - Brain Workout screenshot #2 for iPhone
Shikaku - Brain Workout screenshot #3 for iPhone
Shikaku - Brain Workout screenshot #4 for iPhone
iphone
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About

This logic puzzle game challenges you to divide a grid into rectangles and squares. Each shape must contain a single number, and its area must match that number. Enjoy hundreds of levels offline with a clean interface.

Grid division logic puzzles
Hundreds of levels
Offline play
Minimalist interface
No timers or pressure
Beginner to expert difficulty
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What's New in Shikaku

1.2.7

July 21, 2026

New mechanics

1

In-App Purchases

$5.99

Zen Mode

Remove interruptive ads

User reviews

Still easy after 500 levels

I got to level 501. It’s a time sink when waiting to do something, but the levels don’t change much and the hard levels aren’t that hard, if not easy

I loved this game until I didn’t.

This is a grit game and I loved playing it until I reached about level 250. Then it started presenting the same game repeatedly, and finally gave me a layout with 6 contiguous mystery groups, no size or shape given. There are hundreds of possible combinations and working through them could take hours. I tried a few times to see if I’d get lucky, then deleted the game. No thanks, guess I topped out. Also, it’s really annoying to have to close and open the app to start each game due to the fact that the ads , once started, literally do not stop, ever.
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What have you done?

I was really enjoying this game until the latest update. Now it’s just frustrating. The music is ok though the haptics are a little annoying but can be turned off. The animations at the end of the levels are cute if a little childish as is the font used for the numbers now. Annoyed because I paid for this game since I was enjoying it so much. It’s irritating now. You know what they say… if it ain’t broke, don’t fix it!
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Awesome

Great game barely any ads super fun definitely recommend

Severance

Pretty sure it was brainwashing me somehow or I’m going to get a call from Lumin headquarters… too easy, too addictive… see you on the inside

Developer apps

FAQ

What is Cortex Shikaku?

Cortex Shikaku is a logic puzzle game where players divide a grid into rectangles and squares. Each shape must contain a single number, and its area must match that number. It's designed to be a relaxing yet challenging brain workout.

How do you play Cortex Shikaku?

The game presents a grid with numbers. You must divide the grid into distinct rectangular or square regions. Each region should contain exactly one number, and the area of that region must be equal to the number it contains.

Can I play Cortex Shikaku offline?

Yes, Cortex Shikaku can be played entirely offline, meaning no Wi-Fi connection is required. This makes it a great option for playing anywhere, anytime.

What kind of levels does Cortex Shikaku offer?

Cortex Shikaku features hundreds of levels that range in difficulty from beginner to expert. This variety ensures there's always a new challenge for players of all skill levels.

Does Cortex Shikaku have ads?

Yes, Cortex Shikaku contains advertisements. As a free game, ads are displayed to support its development and continued availability.

What is the age rating for Cortex Shikaku?

Cortex Shikaku has an age rating of 12+. This indicates it is suitable for players aged 12 and above.

How often is Cortex Shikaku updated?

The latest version, 1.2.3, was released on June 24, 2026. Updates typically include new levels, bug fixes, and performance improvements.

What devices can I play Cortex Shikaku on?

Cortex Shikaku is available on iPhone, iPad, and iPod devices. It is designed to run on Apple's iOS platform.