Learn Coding vs Coding Games for Kids

Land your next tech job. Off By One turns learning to code and coding interview prep into a five-minute daily habit. Real interview problems, taught the way you actually learn: step by step, with animated visualizations, guided code building, and complexity quizzes. You watch the algorithm move, then you build it yourself, then you prove you understand why it works. No copy-pasting into a judge, no walls of text. WHAT'S INSIDE • 64 guided lessons across 14 topics: arrays and hashing, two pointers, sliding window, stacks, binary search, linked lists, trees, tries, heaps, backtracking, graphs, dynamic programming, greedy algorithms, and intervals • Every lesson in Python, Java, and JavaScript, each written for that language by hand, never transliterated: the JavaScript version asks JavaScript questions, the Java version asks Java questions • Animated, step-by-step visualizations that show how each algorithm actually works: pointers travel, windows slide, trees traverse • Big-O time and space quizzes on every problem, so you can explain the "why" in the room, not just recite the code • 20 system design stories covering caching, load balancing, sharding, CDNs, rate limiting, database indexing, message queues, CAP, WebSockets, and more • A beginner intro for every topic, so you can start from zero and still end up interview-ready • Streaks, weekly progress charts, and an activity grid that keep you honest, five minutes at a time HOW A LESSON WORKS 1. Understand the problem and the approach in plain language 2. Watch the algorithm run, one step at a time 3. Build the solution yourself with guided code steps 4. Answer for its time complexity 5. Answer for its space complexity Finish a lesson and the next one is waiting: the curriculum is ordered so every topic builds on the one before it. WHO IT'S FOR • Complete beginners who want to learn to code with a clear goal • CS students preparing for internship and new-grad interviews • Self-taught developers filling the data structures and algorithms gap • Working engineers brushing up before the next interview loop START FREE Every lesson and story opens free: read the problem, watch the first steps, get a feel for it. Premium unlocks full visualizations, code building, complexity training, and system design. Off By One Premium is an auto-renewing subscription. Plans: annual with a 3-day free trial, monthly with a 3-day free trial, or weekly. Prices are shown in the app in your local currency. Payment is charged to your Apple ID account at purchase confirmation, or when the free trial ends. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel in your Apple ID settings. Unused trial time is forfeited on purchase. Privacy Policy: https://www.ijustwantagoodjob.com/off-by-one/privacy-policy Terms of Use: https://www.ijustwantagoodjob.com/off-by-one/terms-of-service

Program a robot. Find the animal. Learn to code! Floor Robot is a fun, beginner-friendly puzzle game that introduces kids to the basics of programming. Give your robot a sequence of commands — up, down, left, and right — then press GO and watch it follow your instructions across the board. HOW TO PLAY • Look at the grid and find where the animal is hiding • Tap the directional arrows to build a sequence of commands • Hit the GO button and watch your robot execute your program • Reach the animal to complete the level! But watch out — water tiles block your path! You'll need to plan your route carefully to navigate around obstacles and reach the goal. FEATURES • 30 handcrafted puzzle levels with increasing difficulty • Grids that grow from 5×5 to 9×9 as your skills improve • Earn up to 3 stars per level by finding the shortest path • 30 adorable animals to discover — cats, foxes, penguins, capybaras, and more • Colourful, kid-friendly design with simple tap controls • No ads, no in-app purchases, no internet required • Safe for kids of all ages LEARN REAL CODING CONCEPTS Floor Robot teaches sequential thinking, problem-solving, and algorithmic planning — the same foundations used in real programming. Kids learn that computers follow instructions exactly as given, and that planning ahead is the key to success. Perfect for children aged 4 and up, parents looking for screen time with substance, and anyone who enjoys a good logic puzzle.