Select the "Secret Characters" extra while playing in Free Play mode on the "Into The Mountains" mission to get Santa Claus. In the last area of the level, get all of blue blocks and put them on the blue platform. Then, build both platforms to get on top of the mountain edge. Follow the path and to find a house. Continue and you will see presents and Lego blocks that will make a sleigh. Go in the chimney and break the boxes. There will be a candy cane weapon as well as Santa Claus.