Puzzle is a quick introduction to Blockly's shapes and how the pieces snap together.
Maze is an introduction to loops and conditionals. It starts simply, but every level is more challenging than the last.
Bird is a deep-dive into conditionals. Control-flow is explored with increasingly complex conditions.
Turtle is a deep-dive into loops. Use nested loops to paint a picture.
Movie is an introduction to mathematical equations. Use math to animate a movie.
Music is an introduction to functions. Use functions to compose music.
Pond Tutor introduces text-based programming. Levels switch back and forth between blocks and actual JavaScript in a text editor.
Pond is an open-ended contest to program the smartest duck. Use either blocks or JavaScript.