Learn by Playing

Don't read it. Make it run.

Every game here uses real code — not multiple choice. Fill in the missing pieces, hit run, and watch whether it actually works.

Fill in the missing pieces of real JavaScript and watch it actually run.

A snippet flashes up — call it before the timer runs out. Works for every course.

Match a target layout with your own CSS — live preview scores how close you got.

Write a CSS selector and watch the matching elements light up.

Program a robot through a grid maze, one instruction at a time.

Real commands, a fake filesystem, puzzle rooms you type your way out of.

Solve a case by querying a real database — no clue without a working query.

Crack a case with real MongoDB queries — find(), $elemMatch, and all.