# Modstack: Programming Puzzle — Robot Code Logic Puzzles

> Robot Code Logic Puzzles (iPhone/iPad app by NovoBuild LLC.)

- Source: https://appshunter.io/ios/app/modstack-programming-puzzle/id6803866356 (this page in markdown: same URL + `.md`)
- Developer: [NovoBuild LLC](https://appshunter.io/developer/1784126512)
- Category: Games, Education, Puzzle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 30 MB
- Languages: American English
- Released: 2026-08-28
- Data updated: 2026-09-24
- User reviews in markdown: https://appshunter.io/ios/app/modstack-programming-puzzle/id6803866356/reviews.md

## What is Modstack?

Modstack is a tactile programming puzzle about making big moves with a small
set of commands.

Place Move and Turn tiles into a program, stack modifiers to change what they
do, then run your machine. Watch the robot execute each step, learn from the
result, and compress your solution until it reaches par.

WHAT YOU GET

- 36 handcrafted campaign circuits across six chapters
- A gentle visual introduction to programs, repetition, and mirroring
- Ordered relays, switches, gates, and precision Expert Circuits
- A new Easy, Medium, and Hard Daily Circuit every day
- Layered hints that nudge without giving away the whole solution
- Offline play with progress stored on your device
- Purpose-built sound and haptic feedback
- No ads, no account, and no tracking

The Foundations chapter and Easy Daily are free. A single Full Game Unlock
opens the remaining 30 campaign circuits plus Medium and Hard Daily. There is
no subscription.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock Full Modstack | $3.99 | one-time |



## Version history (last 3 releases)

### 1.0.2 — 2026-09-14

- Added Rate Modstack, Send Feedback, and More from NovoBuild to Settings.
- Refined the Settings layout for clearer support and progress controls.
- Improved review-prompt reliability after meaningful puzzle wins.

### 1.0.1 — 2026-09-09

- Complete Foundations, then try a free switch-and-gate Power Circuit.
- Keep moving after an over-par solution, then return to compress it for the checkmark.
- Preview today's par, rotation, and featured mechanic on every Daily Circuit.
- Run programs at 1X or 2X speed.
- Enjoy clearer board sizing, execution feedback, gate effects, and celebrations.
- Recover the Full Game Unlock automatically through verified StoreKit entitlements.

### 1.0 — 2026-08-28

No release notes.

## More apps by NovoBuild LLC

- [Stonegate: The Mad Baron](https://appshunter.io/ios/app/stonegate-the-mad-baron/id6788900593)
- [LeanSignal: Weight & Body Fat](https://appshunter.io/ios/app/leansignal-weight-and-body-fat/id6791556289)
- [CashSpan: Irregular Income](https://appshunter.io/ios/app/cashspan-irregular-income/id6791994565)
- [Lastmark: When Did I Last?](https://appshunter.io/ios/app/lastmark-when-did-i-last/id6792133215)
- [Approach Daily: Runway Puzzle](https://appshunter.io/ios/app/approach-daily-runway-puzzle/id6797687848)
- [Playlist Orbit: Music Player](https://appshunter.io/ios/app/playlist-orbit-music-player/id6797837498)

All apps by NovoBuild LLC: https://appshunter.io/developer/1784126512

---

*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 2026-09-24.*