Cook macaroni in boiling salted water until almost tender.

In a small saucepan, melt butter.

Stir in flour, salt, mustard, pepper and hot pepper sauce.

Cook and stir until smooth.

Drain macaroni; combine with butter mixture in a large bowl and mix well.

Stir in milk and 4 cups of cheese.

Pour into an ungreased 13x9x2" baking dish.

Cover and bake at 350 degrees for 45 minutes or until bubbly.

Sprinkle with remaining cheese; let stand 5 minutes before serving.