The full catalog

Crash-land on an island and write SQL queries to talk to villagers, trade and escape. Learn databases by surviving.

Fill a crossword grid where every clue is a regular expression — a puzzle game that quietly turns you fluent in regex.

A gentler Scratch-style app for young children, focused on sequencing, characters, pages and playful early coding.

A free set of browser puzzles that introduce programming concepts through blocks before revealing the JavaScript underneath.

Visually program little robots to gather, craft and terraform a frozen planet back to life.

A real-time strategy adventure where you program your robots in CBOT, a language close to C++ and Java.

Learn Python or JavaScript by playing a top-down RPG where every move is a line of code you write.

A browser MMORPG where you can play by hand — or open the console and code up to four characters in JavaScript.

Solve puzzles by writing one program that an entire team of heroes runs in parallel — coordination is the challenge.