Cut off and discard wing tips and excess skin.
Cut wings in half at joint.
Place in 8x8-in baking dish.
Combine sugar, vinegar, soy sauce and catsup.
Pour over wings.
Marinate 3 to 4 hours, or overnight in refrigerator, stirring once or twice to coat.
Microwave at High 11 to 22 minutes, or until fork tender when checked in several places, pushing center portions to outside of dish after half the time.