# Sliding Puzzle vs HydroValve

The clearest difference is in-app purchases: Sliding Puzzle at none against HydroValve's 1. HydroValve's advantage is update cadence (daily vs monthly) and iOS requirement (15.0 vs 26.1). On price, ads and device support there is nothing between them.

Both are free to download. HydroValve sells 1 one-off in-app purchase. Sliding Puzzle asks for nothing beyond the download.

Sliding Puzzle ships an update monthly, HydroValve daily. The most recent releases landed on October 25, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Sliding Puzzle | HydroValve |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Monthly | **Daily** |
| Size | 5 MB | 63 MB |
| Requires iOS | 26.1 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [MIZOU, CO., LTD.](https://appshunter.io/developer/1542553141) | [AbsoluteNoobStudio](https://appshunter.io/developer/1896690388) |

## What reviewers say

### Sliding Puzzle

[App page](https://appshunter.io/ios/app/sliding-puzzle-path-link/id6756993722)

**Features:** macOS Compatibility

**In-app purchases:** none


### HydroValve

[App page](https://appshunter.io/ios/app/hydrovalve/id6808785143)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


## Frequently asked questions

### Is Sliding Puzzle free?

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

### Is HydroValve free?

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

### Do Sliding Puzzle or HydroValve have ads?

Both Sliding Puzzle and HydroValve show ads.

### Which is updated more often, Sliding Puzzle or HydroValve?

Sliding Puzzle ships an update monthly, and HydroValve daily. Most recently, Sliding Puzzle was updated on October 25, 2026 and HydroValve on October 9, 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.*