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  • Searching for a non-existent gem in the backpack 🎒

    JAVA 25 SELF
    Level 11, Lesson 1
    Searching for a non-existent gem in the backpack 🎒
    1
    Locked
  • Player age: "twenty" instead of 20 🎮

    JAVA 25 SELF
    Level 11, Lesson 1
    Player age: "twenty" instead of 20 🎮
    1
    Locked
  • Missing Secret Agent Name 🤫

    JAVA 25 SELF
    Level 11, Lesson 1
    Missing Secret Agent Name 🤫
    1
    Locked
  • Reliable Explorer Robot 🤖

    JAVA 25 SELF
    Level 11, Lesson 2
    Reliable Explorer Robot 🤖
    1
    Locked
  • Invalid access to the hero's backpack 🛡️

    JAVA 25 SELF
    Level 11, Lesson 2
    Invalid access to the hero's backpack 🛡️
    1
    Locked
  • Diagnosing an issue in the scoring system 📈

    JAVA 25 SELF
    Level 11, Lesson 2
    Diagnosing an issue in the scoring system 📈
    1
    Locked
  • Critical Mission Control System 🚀

    JAVA 25 SELF
    Level 11, Lesson 2
    Critical Mission Control System 🚀
    1
    Locked
  • Cleaning Robot and Its Completion Report 🧹

    JAVA 25 SELF
    Level 11, Lesson 3
    Cleaning Robot and Its Completion Report 🧹
    1
    Locked
  • Scoring system: positive values only! 🏅

    JAVA 25 SELF
    Level 11, Lesson 3
    Scoring system: positive values only! 🏅
    1
    Locked
  • Critical module and emergency termination with report 💥

    JAVA 25 SELF
    Level 11, Lesson 3
    Critical module and emergency termination with report 💥
    1
    Locked
  • Username validation in the registration system 📝

    JAVA 25 SELF
    Level 11, Lesson 3
    Username validation in the registration system 📝
    1
    Locked
  • Secret Document Access Module 📁

    JAVA 25 SELF
    Level 11, Lesson 4
    Secret Document Access Module 📁
    1
    Locked
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CodeGym CodeGym is an online course for learning Java programming from scratch. This course is a perfect way to master Java for beginners. It contains 1200+ tasks with instant verification and an essential scope of Java fundamentals theory. To help you succeed in education, we’ve implemented a set of motivational features: quizzes, coding projects, content about efficient learning, and a Java developer’s career.
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Programmers Are Made, Not Born © 2026 CodeGym