# Robo Trails — Code: loops, functions, debug

> Code: loops, functions, debug (iPhone/iPad app by Phuc Huynh.)

- Source: https://appshunter.io/ios/app/robo-trails/id6798311822 (this page in markdown: same URL + `.md`)
- Developer: [Phuc Huynh](https://appshunter.io/developer/6779869359)
- Category: Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 14.0 · 16 MB
- Languages: American English
- Released: 2026-08-18
- Data updated: 2026-08-28
- User reviews in markdown: https://appshunter.io/ios/app/robo-trails/id6798311822/reviews.md

## What is Robo Trails?

Robo Trails turns real computer-science thinking into a friendly, tap-only puzzle — no reading or typing required. Give a cheerful robot a program made of command tiles, press Run, and watch it drive across the grid leaving a glowing trail, lighting up every star tile.

It's the ideas real programmers use, one gentle step at a time:
• SEQUENCE — put commands in the right order: Forward, turn Left/Right, and Light.
• LOOPS — a Repeat block does a pattern again and again, so you do more with fewer tiles.
• FUNCTIONS — teach the robot a mini-routine (P1/P2) and call it whenever you need it.
• DEBUG — a program that's almost right is loaded for you; find the one thing to fix.

A TILE BUDGET that grows the mindset
Every puzzle has a limited number of tiles, so kids are nudged to spot the pattern and use a loop or a function instead of brute force. Fewer tiles earns more stars — elegance, not just success.

A REAL DUEL
• Two players take turns on the SAME puzzle — a "pass the tablet, no peeking" screen keeps it fair; the faster correct program wins the round, best of three.
• Or race a friendly computer you can actually beat.

FOR FAMILIES
• Free: the whole Sequence world (solo) + all 2-Player + vs Computer, forever.
• One optional, one-time unlock adds the solo Loops, Functions & Debug challenges — behind a parental gate, no ads, no subscriptions.
• 100% offline — no accounts, no data collected.
• 11 languages with full right-to-left support.

Every puzzle is guaranteed solvable, and failures are gentle — the robot just stops, and you tweak your program and try again. Perfect for curious kids (and grown-ups) taking their first steps into coding.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Full Game — Loops, Functions, Debug | $5.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-08-18

No release notes.

## More apps by Phuc Huynh

- [Math Duel: 2-Player Math](https://appshunter.io/ios/app/math-duel-2-player-math/id6779869357)
- [Tangram: Shape Puzzle](https://appshunter.io/ios/app/tangram-shape-puzzle/id6780157329)
- [Abacus: Bead Math](https://appshunter.io/ios/app/abacus-bead-math/id6780208319)
- [Cornhole Math: Bag Toss](https://appshunter.io/ios/app/cornhole-math-bag-toss/id6780393652)
- [Domino Math](https://appshunter.io/ios/app/domino-math/id6780782649)
- [Ashta Chamma: Cowrie Race](https://appshunter.io/ios/app/ashta-chamma-cowrie-race/id6782073176)

All apps by Phuc Huynh: https://appshunter.io/developer/6779869359

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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 2026-08-28.*