In a 13x9x2-inch baking pan stir together broken rice cakes, corn cereal or oyster crackers, and pretzels.
In a small bowl stir together melted margarine, Worcestershire sauce, and curry powder. Drizzle margarine mixture over cereal mixture. Toss until coated.
Bake in a 300 degree F oven for 20 minutes, stirring twice. Cool about 30 minutes before serving. If desired, store cooled mixture in a tightly covered container up to 3 days. Makes 6 (1/2-cup) servings.