# Building Puzzle 2 vs Kurotto Extreme

The clearest difference is review sentiment: Kurotto Extreme at 100% against Building Puzzle 2's 50%. Building Puzzle 2's advantage is ads (none vs shown) and update cadence (every 9 days vs every 22 months). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Building Puzzle 2 ships an update every 9 days, Kurotto Extreme every 22 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Building Puzzle 2 | Kurotto Extreme |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/kurotto-extreme/id1499171663/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 9 days** | Every 22 months |
| Monetization | **Free** | Ad-supported |
| Size | 14 MB | 22 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yuki Fujimoto](https://appshunter.io/developer/467085185) | [Christophe Baranger](https://appshunter.io/developer/982794089) |

## What reviewers say

### Building Puzzle 2

[App page](https://appshunter.io/ios/app/building-puzzle-2/id1173315386)

A logic puzzle game with over 10,000 stages. It features hints within the grid to help players solve challenges. All stages are available to play for free.

**Highlights:** Over 10,000 stages, In-grid hints, Logic puzzle gameplay, Free to play all stages

**Features:** macOS Compatibility

**In-app purchases:** none


### Kurotto Extreme

[App page](https://appshunter.io/ios/app/kurotto-extreme/id1499171663)

A logic puzzle game originating from Japan with simple rules for hours of engaging challenges. Fill empty cells based on numbered circles indicating continuous black cells, with no time limits and autosave functionality.

**Highlights:** 350+ challenges across 7 difficulty levels, 7 new daily challenges, Autosave progress, No time limits, 2 global leaderboards, Full tutorial

**In-app purchases:** none


## Frequently asked questions

### Is Building Puzzle 2 free?

Building Puzzle 2 is free to download, with no in-app purchases.

### Is Kurotto Extreme free?

Kurotto Extreme is free to download, with no in-app purchases.

### Do Building Puzzle 2 or Kurotto Extreme have ads?

Kurotto Extreme shows ads; Building Puzzle 2 does not.

### Which is updated more often, Building Puzzle 2 or Kurotto Extreme?

Building Puzzle 2 ships an update every 9 days, and Kurotto Extreme every 22 months. Most recently, Building Puzzle 2 was updated on November 2, 2026 and Kurotto Extreme on November 3, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*