Challenge Hub
65+ coding puzzles across 13 themed packs. Solve challenges, earn stars, and learn real JavaScript and Python along the way.
Open Challenge HubHow Challenges Work
Read the Goal
Each challenge tells you what output to produce. Figure out which blocks to use and how to connect them.
Build & Check
Snap blocks together and hit Check Solution. If the output matches, you pass. Hints are available if you get stuck.
Earn Stars
Each challenge has a par (block count). Match it for 3 stars. Use fewer blocks and challenge yourself.
13 Theme Packs
Each pack has 5 challenges that tell a story. Complete them all to unlock the next.
Getting Started
Hello World, counting, math, loops, and variables. Your first 5 programs.
Read more →Minecraft
Build a pickaxe, craft torches, smelt iron, and explore the Nether.
Read more →Pet Simulator
Name your pet, feed it, teach tricks, and watch its happiness grow.
Read more →Space Explorer
Launch rockets, calculate orbits, and explore alien planets.
Read more →Robot Factory
Program robots, build assembly lines, and automate everything.
Read more →Secret Agent
Decode messages, crack ciphers, and complete spy missions.
Read more →Treasure Hunt
Follow clues, solve riddles, and find the hidden treasure.
Read more →Game Builder
Build game mechanics: scores, levels, enemies, and power-ups.
Read more →Hacker Terminal
Parse logs, brute-force passwords, and decode hex strings.
Read more →Music Festival
Create playlists, calculate ticket prices, and manage festivals.
Read more →Science Lab
Unit conversions, chemical formulas, and data analysis.
Read more →Startup Sim
Calculate revenue, track growth, and make business decisions.
Read more →Euler Blocks
Computational puzzles inspired by Project Euler. Pure math and logic.
Read more →Ready to take on the challenges?
Start with Getting Started and work your way up. No account needed.
Open Challenge Hub