Cook macaroni according to package directions; drain and rinse with hot water. Turn into a 2-quart buttered casserole. In saucepan, melt 4 tablespoons of butter; stir in flour and milk. Cook sauce, stirring, until smooth and thickened. Add salt, pepper, Worcestershire sauce, and 1 1/2 cups of the shredded cheese.
Chop eggs coarsely; scatter chopped eggs and flaked tuna over macaroni. Pour cheese sauce over all. Sprinkle with remaining cheese mixed with bread crumbs and remaining 2 tablespoon of melted butter. Bake at 375° for 30 to 40 minutes, or until browned and bubbly.
Calories per serving: 533