Heat oven to 350.
In a large bowl, mash devil's food cake mis, 1/2 c. butter, and 1 egg until well combined. Repeat in separate bowls with other cake mixes.
Press devil's food mixture in bottom of ungreased 9x13 pan.
Press white mixture over top of devil's food.
Press strawberry mixture over white.
Bake 40 - 50 minuts or until a toothpick inserted in center comes out clean. Cool completely, about 45 min. Cut into bars.