This piñata is a modified version of the Fortnite Llama Loot Piñata.
Start by carefully opening the base of the piñata, gently removing the feet as you go (if you or someone you know likes Fortnite, save what's inside for them).
Once the piñata has been emptied, fold the flaps over and tape them down. This will help stiffen the cardboard and help it function as a trap door.
On the servo, use a small phillips screwdriver to attach a single arm servo horn (included) to the servo. Be sure to use the short screw as longer screws may damage the motor.
Next, find a paperclip and straighten it out.
Use pliers to bend a small hook and insert this through the last hole in the servo arm.
Gauge where you'd like the servo motor to be inside the piñata, rotating the arm to its start point to make sure it will be able to fully close the door.
Use a square of double sided foam tape to stick the servo motor inside piñata.
Poke the other end of the paper clip through the cardboard flap, bending it at a 90° angle to hold it in place.
Use small pieces of double sided tape to stick the Circuit Playground Express and battery to the back of the piñata.
Gather the cables together with a twist tie to keep them tidy.
Your modified piñata is now ready to rock!