# Sudoku² vs BioTechShala

The clearest difference is ads: BioTechShala at none against Sudoku²'s shown. Sudoku²'s advantage is update cadence (every 4 months vs every 10 months) and iOS requirement (12.0 vs 15.5). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Sudoku² sells 1 one-off in-app purchase and BioTechShala sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Sudoku² ships an update every 4 months, BioTechShala every 10 months. The most recent releases landed on November 6, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Sudoku² | BioTechShala |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (10 ratings)](https://appshunter.io/ios/app/sudoku/id959450517/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 80.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 4 months** | Every 10 months |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 147 MB |
| Requires iOS | **12.0** | 15.5 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [春 李](https://appshunter.io/developer/525245233) | [Online Learning](https://appshunter.io/developer/1790866777) |

## What reviewers say

### Sudoku²

[App page](https://appshunter.io/ios/app/sudoku/id959450517)

Engage with an endless supply of Sudoku puzzles, ranging from easy to challenging difficulty levels. Features include a distraction-free input pad, note-taking with color options, and customizable error checking. Unlock new levels by completing a single puzzle.

**Highlights:** Infinite Sudoku puzzles, Adjustable difficulty levels, Distraction-free input pad, Color-coded note-taking, Manual/automatic note-taking, Customizable error checking, Multiple highlight modes

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Advertisement | $0.99 | one-time |


### BioTechShala

[App page](https://appshunter.io/ios/app/biotechshala/id6503184549)

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Package - AF | $19.99 | one-time |
| Package - AN | $29.99 | one-time |
| Package - AT | $34.99 | one-time |
| Package - AU | $34.99 | one-time |
| Package - BD | $39.99 | one-time |
| Package - AY | $39.99 | one-time |
| Package - BA | $39.99 | one-time |
| Package - BB | $39.99 | one-time |
| Package - BE | $44.99 | one-time |
| Package - BG | $49.99 | one-time |


## Frequently asked questions

### Is Sudoku² free?

Sudoku² is free to download, with in-app purchases available.

### Is BioTechShala free?

BioTechShala is free to download, with in-app purchases available.

### Do Sudoku² or BioTechShala have ads?

Sudoku² shows ads; BioTechShala does not.

### Which is updated more often, Sudoku² or BioTechShala?

Sudoku² ships an update every 4 months, and BioTechShala every 10 months. Most recently, Sudoku² was updated on November 6, 2026 and BioTechShala on November 4, 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.*