# Debugging: Inside the Machine — AP CSP & CSA debug practice > Arcade platformer for AP Computer Science debugging practice. (iPhone/iPad app by Kevin P Hare LLC.) - Source: https://appshunter.io/ios/app/debugging-inside-the-machine/id6764385144 (this page in markdown: same URL + `.md`) - Developer: [Kevin P Hare LLC](https://appshunter.io/developer/1343264116) - Category: Education, Games - Price: Free - Rating: 5.00/5 from 4 App Store ratings · 2 written reviews indexed - Age rating: 4+ - Requires: iOS 15.0 · 6 MB - Languages: American English - Released: 2026-04-29 - Data updated: 2026-07-08 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/debugging-inside-the-machine/id6764385144/reviews.md ## What is Debugging? Debugging: Inside the Machine is a free debugging-practice arcade platformer for students preparing for AP Computer Science Principles or AP Computer Science A. You're inside a corrupted machine — find the USB Key, fix the glitches, and escape the firewall before the system collapses. CSP and CSA modes ship in the same app. Tap once to switch. — EASY · MED · HARD — Each difficulty is a different level, with its own glitch tilemap and its own question bank. CSP topics: Selection, Iteration, Functions & Lists. CSA topics: Variables · Strings, Iteration · Loops, Arrays · Recursion. Two bonus levels (K-Pop Demon Hunters, Minecraft) unlock when you've cleared all three difficulties. — CODE LENS — Glitches scatter across each level as collectible bugs. When you're in range, the CODE LENS button pulses on screen. Tap it and a real multiple-choice debugging question appears: read the broken code, pick the actual bug from four explanations, and the glitch repairs. Wrong answer? Stability drops 10 percent. Right answer? Stability recovers 5 percent and the level inches closer to stable. — Real questions, not filler — Every question is hand-written and scoped to AP exam topics. No random AI hallucinations, no off-curriculum trivia. The pseudocode reference card (CSP) and Java Quick Reference (CSA) are one tap away during any question. — Built for phones and tablets — Touch controls only. Bottom-left D-pad to move, big JUMP button on the right, hold for higher jump. Question screens use full-size answer buttons. Designed for landscape iPhone and iPad. — Offline, no account, no tracking — Everything ships in the app. The game makes zero network calls, collects zero analytics, and requires no sign-in. — More from CS++ — A "More from CS++" button connects you to the rest of the CS++ family: the AP CSP and AP CSA full-curriculum apps, the CS++ Java IDE for on-device Java practice, and the free csplusplus.com web resources (curriculum, vocab trainer, practice exams). For: AP CSP and AP CSA students, CS teachers building exam prep sessions, anyone who likes finding bugs. ## Key features - Debugging practice arcade platformer - AP CSP & CSA modes - Multiple difficulty levels - Collectible bugs with multiple-choice questions - Offline play, no account required - Built for phones and tablets ## Recent user reviews (2 of 2) All indexed reviews: https://appshunter.io/ios/app/debugging-inside-the-machine/id6764385144/reviews.md ### 5/5 — Best App Ever *2026-04-29* This is a peak app. Best app I’ve ever used. Ever since I started playing Debugging: Inside the Machine, I’ve hopped off from all my other video games. Now I have no life and spend 16 hours a day on this app. I highly recommend this to everyone. Mr. Hare is awesome. Mean Girls is awesome. Mr. Hare pls give me an A+ ### 5/5 — What a way to learn *2026-04-29* kevin hare is a great software developer. From his incredible learning resources to all his outside projects, kev never ceases to amaze me. although all this is great and i learned so much from this app, this app doesn’t come close to kev’s best invention, the freshman finder. what a great invention. ## Frequently asked questions about Debugging ### What is Debugging: Inside the Machine? Debugging: Inside the Machine is a free arcade platformer designed to help students practice debugging skills for AP Computer Science Principles and AP Computer Science A exams. It features in-game challenges that simulate real exam questions. ### Does Debugging: Inside the Machine have ads? No, Debugging: Inside the Machine is completely ad-free. The game makes zero network calls, collects zero analytics, and requires no sign-in, ensuring an uninterrupted learning experience. ### What AP Computer Science topics does Debugging: Inside the Machine cover? The app covers CSP topics like Selection, Iteration, Functions & Lists, and CSA topics including Variables, Strings, Iteration, Loops, Arrays, and Recursion. Each difficulty level focuses on specific question banks related to these topics. ### Can I play Debugging: Inside the Machine offline? Yes, the game is designed for offline play. Everything is included within the app, so no internet connection is required to access content or play the game. ### What devices is Debugging: Inside the Machine available on? Debugging: Inside the Machine is built for phones and tablets, specifically designed for landscape iPhone and iPad. It supports touch controls for movement and jumping. ### How does the debugging practice work in Debugging: Inside the Machine? Glitches in the game appear as collectible bugs. When you are near a glitch, the CODE LENS button pulses. Tapping it presents a multiple-choice debugging question where you must identify the bug in the provided code. ### What happens if I answer a question incorrectly in Debugging: Inside the Machine? If you answer a debugging question incorrectly, the system's stability drops by 10 percent. Conversely, a correct answer recovers 5 percent of stability and moves the level closer to being stable. ### Are the questions in Debugging: Inside the Machine real exam questions? Yes, every question in Debugging: Inside the Machine is hand-written and specifically scoped to AP exam topics. The app avoids random AI-generated content or off-curriculum trivia. ## Version history (last 3 releases) ### 1.0.7 — 2026-04-30 What's new in 1.0.7 • Answer choices now use A, B, C, D — consistent with the AP exam. • Question-bank cleanup: clearer wording, removed cases with more than one defensible answer, and repaired a Java snippet that didn't compile. • Home-screen layout fix: the CSP/CSA mode toggle now stays on one line on smaller iPhones and no longer overlaps the Start button. ### 1.0.6 — 2026-04-29 Audio improvements, layout polish, music/SFX toggles, bug fixes ### 1.0 — 2026-04-29 No release notes. ## More apps by Kevin P Hare LLC - [CS++ Java IDE](https://appshunter.io/ios/app/cs-plus-plus-java-ide/id6763799792) - [CS++ AP CSA](https://appshunter.io/ios/app/cs-plus-plus-ap-csa/id6763950108) - [CS++ AP CSP](https://appshunter.io/ios/app/cs-plus-plus-ap-csp/id6763950898) All apps by Kevin P Hare LLC: https://appshunter.io/developer/1343264116 ## Related topics [debugging](https://appshunter.io/ios/topics/debugging) --- *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 2026-07-08.*