Your logic lab
Computer science quizzes, mathematics games, and clear explanations. Learn at your own pace by following your curiosity.
Short sessions · instant feedback
Which data structure would you use?
Two worlds, one method
From the web to algorithms, one question at a time.
Numbers, shapes, and strategies to put to the test right away.
Test yourself
Short activities, clear goals, and useful explanations after every answer.
Each attempt draws 15 questions from a bank of 100 original questions about hardware, software, operating systems, files, networks, and security. This is an independent, unofficial practice activity inspired by Computer Essentials topics.
StartEach attempt draws 15 questions from a bank of 100 original questions about Web browsing, online search, communication, email, and calendars. This is an independent, unofficial practice activity inspired by Online Essentials topics.
StartObserve the pattern, form a hypothesis and find the next number.
StartDaily challenge • No account required
Use each number only once and combine the four basic arithmetic operations.
Read and understand
Articles organized by topic, practical examples, and precise language.
Reworked classics and new situations: 25 puzzles with hidden hints and explanations, separating facts, assumptions and possible answers.
ReadTen advanced set problems: inclusion–exclusion, symmetric differences, families, functions and limits, with hidden hints and illustrated solutions.
ReadFive reworked classics and five newly framed problems, with equations, constraints, rejected roots and step-by-step checks.
ReadEvery concept starts with an example.
Understand why, not just the answer.
The interface is ready for FR, ES, IT, and EN.
