# ThinkSync Puzzles — Sudoku brain training at 40 Hz

> Sudoku brain training at 40 Hz (iPhone/iPad app by CHRISTIAN PETER.)

- Source: https://appshunter.io/ios/app/thinksync-puzzles/id6805787883 (this page in markdown: same URL + `.md`)
- Developer: [CHRISTIAN PETER](https://appshunter.io/developer/1885027430)
- Category: Games, Health & Fitness, Casual, Puzzle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.0 · 1 MB
- Languages: American English, German (Germany), European Spanish
- Released: 2026-09-09
- Data updated: 2026-09-28
- User reviews in markdown: https://appshunter.io/ios/app/thinksync-puzzles/id6805787883/reviews.md

## What is ThinkSync Puzzles?

Your brain works in rhythms. ThinkSync puts one behind the puzzle.

Sudoku is thinking you actually enjoy — you hold nine numbers in your head, test a
guess, take it back. ThinkSync adds a rhythm to it: while you solve, light and sound
pulse forty times a second. You hear it and you see it. If it distracts
you, switch it off and keep playing. The puzzle stands on its own.

THE 40 HZ RHYTHM
Rhythmic light and sound in the gamma band around 40 Hz is studied at MIT and
elsewhere. There are research findings suggesting that such stimulation influences
gamma activity in the brain. What that activity means for attention and memory is
still being studied — and we link the papers, including the ones that found nothing.

BRING YOUR OWN MUSIC
Start Spotify or Apple Music, then start a puzzle. ThinkSync layers its stimulation
over whatever is playing, and a slider lets you decide how present it should be.
Nothing is interrupted and nothing is taken over.

THE PUZZLES
Four levels, from easy to expert, each generated fresh and each with exactly one
solution. Nothing is downloaded and nothing repeats.

A new Puzzle of the Day every morning, the same one for everyone. Mondays start
gently and Sundays are for experts. A calendar shows the days you have finished.

TRAIN, AND SEE IT
Nineteen trophies, from your first solved puzzle to a flawless run without a single
mistake or hint. Best times per level. Your streak counts days, not puzzles — solve
one a day and it keeps going.

A game in progress survives closing the app. Come back tomorrow and the grid is
exactly where you left it.

BUILT PLAINLY
No account. No tracking. No ads. No network connection of any kind — everything
happens on your device, and everything works in flight mode.

WHAT IT COSTS
Seven days with everything unlocked. After that you keep three puzzles a day and the
Puzzle of the Day for free, or you unlock everything once, for a single payment.
No subscription, no renewal.

PLEASE NOTE
ThinkSync is a game. It is not a medical device and does not replace therapy or
medical treatment. Flickering light can trigger seizures in people with photosensitive
epilepsy — if that applies to you, leave the light off. The switch is right in the
setup, before the first pulse.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| ThinkSync Unlimited | $4.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-09-10

No release notes.

## More apps by CHRISTIAN PETER

- [NeuroFocus Sessions](https://appshunter.io/ios/app/neurofocus-sessions/id6761327613)
- [axSuisse – Vaccine Passport](https://appshunter.io/ios/app/axsuisse-vaccine-passport/id6770289436)

All apps by CHRISTIAN PETER: https://appshunter.io/developer/1885027430

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*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 2026-09-28.*