Combine the softened cream cheese, shredded cheddar, garlic powder, and smoked paprika in a mixing bowl. Mix until smooth and well blended, with no lumps remaining. The mixture should be soft but firm enough to shape.
Form the cheese mixture into a large, round ball and place it on a parchment-lined baking sheet. Gently press and shape it to resemble a spider's body. Chill in the refrigerator for at least 2 hours until firm.
Preheat the oven to 350°F (175°C). Brush the pretzel sticks with a beaten egg for shine and bake for about 5 minutes until crispy and golden. Let them cool completely before handling.
Once the cheese ball is chilled and firm, insert the pretzel sticks into the sides of the cheese ball to mimic spider legs, spreading them out evenly around the circumference. Use a little extra cheese if needed to help secure the legs.
Decorate the front of the cheese ball with additional cheese or small edible eyes to give it a spooky face if desired. Keep the assembled spider chilled until serving.
Serve the spooky spider cheese ball with an assortment of crackers or sliced almonds around it for dipping and crunching. Enjoy your playful Halloween appetizer!