// 'Test' is the Piece name 
// That's what we will use to create new instance or add this piece as a dependencies
Puzzle.add('Test',{
  // here come some functions
  // these functions will be add in the prototype
  customTestFunction : function(){
    console.log('Do nothing')
    return this;
  }
},[]);

Puzzle.add('Foo',{
  initialize : function(){
    // We add Test piece as de dependency
    // We can use customTestFunction inside our Foo Ojbect
    this.customTestFunction();
    return this;
  }
  // This is where we set dependencies
},['Test']);

//Now we can use Pieces we just create
Puzzle.create('Foo',{
  //properties of the Foo object
  foo : 'bar'
  //this array define witch method we are using right away after creating our Foo object
},['initialize']);