Cadbury Dairy Milk - bar container

Couldn't resist picking this up from the supermarket today. So obvious that I have a weakness for cutesy plastic wares such as this. 

While the top is the same, the bottom comes in a few shades.....red, blue and purple. Naturally I went for the purple one since that's the colour associated to this brand. 

 

What are the mechanics ?
2 large bars of chocolate was all that I had to purchase in order to get this.

 

Compared to say, some duty free place, huh, those places will want you to spend above RM100 before giving you something like this.

Pretty good deal if you ask me.