# Rensa Lab — Daily chain-puzzle lessons

> Daily chain-puzzle lessons (iPhone/iPad app by INPHIL CHOI.)

- Source: https://appshunter.io/ios/app/rensa-lab/id6818004063 (this page in markdown: same URL + `.md`)
- Developer: [INPHIL CHOI](https://appshunter.io/developer/6785766361)
- Category: Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 19 MB
- Languages: American English, Japanese, Korean, Chinese (Simplified, China), Chinese (Traditional, Taiwan)
- Released: 2026-10-01
- Data updated: 2026-10-03

## What is Rensa Lab?

Rensa Lab teaches chain puzzles — the kind where falling blocks clear in groups of four and set off chains — through a problem book. Place your pieces and see right away how many chains you made.

■ Explanations that tell you why
When you miss, we show what actually happened on the board: which group you cleared too early, where the falling blocks joined only a few and stopped, and where the trigger was. Replay the answer chain one step at a time.

■ 7 units, 210 problems
Basics → Find the trigger → Stair links → Sandwich links → Building 101 → Long chains → Advanced building. Start easy and work your way up.

■ Today's Problem
A new problem every day at midnight — easiest on Monday, hardest on Sunday. Home Screen and Lock Screen widgets show today's problem and open it in one tap.

■ Easy on the eyes
A paper-toned background, soft text color and large type. Every color has its own shape (triangle, diamond, square, hexagon), so you can read the board even if colors are hard to tell apart. Dark appearance is available in Settings.

■ Reminders only if you want them
We offer a reminder only after you solve your first problem. Turn it on and you get one reminder a day, at the time you choose.

■ No account, no ads, no server
Start right away without signing up. Your progress stays on this device, and explanations are made on your device without the internet.

■ How it works
Unit 1 (30 problems) and Today's Problem are included with no purchase. Units 2–7 (180 problems) unlock with a one-time purchase — not a subscription — which also includes every problem added later.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://inphilchoi.github.io/chainlab-privacy/

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock All Problems | $2.99 | one-time |


## Is Rensa Lab safe?

Not enough ratings yet to assess Rensa Lab.

## Is Rensa Lab legit?

Rensa Lab appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Rensa Lab is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0.0 — 2026-10-02

No release notes.

## Apps similar to Rensa Lab

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Lily AI](https://appshunter.io/ios/app/lily-ai/id6447797838) | 4.8 (18) | Free | Education |
| [同在（家长版）](https://appshunter.io/ios/app/id1248672188) | 1.0 (1) | Free | Education |
| [(구) 이투스 수강앱 - Smart Study](https://appshunter.io/ios/app/smart-study/id1486564159) | 1.3 (13) | Free | Education |
| [Guitar : Play & Learn Chords](https://appshunter.io/ios/app/guitar-play-and-learn-chords/id405338085) | 4.5 (7,640) | Free | Education |
| [메가스터디 스마트러닝](https://appshunter.io/ios/app/id670116327) | 4.0 (4) | Free | Education |
| [青于蓝](https://appshunter.io/ios/app/id1404817237) | — | Free | Education |

## More apps by INPHIL CHOI

- [Today's Song - One Song a Day](https://appshunter.io/ios/app/todays-song-one-song-a-day/id6785766359)
- [대한민국 달력](https://appshunter.io/ios/app/id6786585716)
- [myTV - Cast Web Videos to TV](https://appshunter.io/ios/app/mytv-cast-web-videos-to-tv/id6792300908)
- [Sudam - Go/Baduk AI](https://appshunter.io/ios/app/sudam-gobaduk-ai/id6795918519)
- [음성노트 - AI 녹음 텍스트 변환](https://appshunter.io/ios/app/ai/id6795930564)
- [LottoLab: Lotto Number Picker](https://appshunter.io/ios/app/lottolab-lotto-number-picker/id6796949878)

All apps by INPHIL CHOI: https://appshunter.io/developer/6785766361

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-03.*