Puffle-So-Cute-O

The Puffle So-Cute-O is a puzzle in the Penguin Times, usually on Page C4.

Rules

 * It is basically a simplified Sudoku with a 3x2 group area, and 6x6 total area.
 * You make sure no puffle of the same colour is in the same group, column, or row, and fill in the empty spaces.
 * To switch puffle colours, click an empty cell.
 * Some cells have puffles already in the you cannot change.
 * The puffles used are Red, Black, Green, Pink, Purple, and Blue.