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.
Fifty advanced problems to tackle with equations, direct reasoning, or lateral thinking, with solutions hidden at first.
ReadFifty challenging real-world problems solvable with first-degree equations. Solutions are hidden and, when useful, include a method without an equation.
ReadWhat % means, how to convert numbers and fractions, how increases and discounts combine, and which percentage reverses a previous change.
ReadEvery concept starts with an example.
Understand why, not just the answer.
The interface is ready for FR, ES, IT, and EN.