Try following the left-hand wall. Advanced programmers only! Maze is an introduction to loops and conditionals. It starts simply, but every level is more challenging than the last.
Draw the shape with just three blocks. Turtle is a deep-dive into loops. Use nested loops to paint a picture. Then publish your art for the world to see.
Blockly Games is a series of educational games that teach programming. It is designed for children who have not had prior experience with computer programming. By the end of these games, one is ready to use conventional text-based languages.