Lovely | Craft Piston Trap %e5%8c%85%e8%a3%b9%e9%80%80%e5%9b%9e Achievement

Place an observer or a comparator reading the delivery chest. When the parcel enters the chest:

Build a 3x3 platform where the incoming parcel will land. Place a Target Block at the center. Surround this block with four sticky pistons facing inward. When powered, they will "crush" the parcel (this is a visual requirement for the "lovely" tag). Place an observer or a comparator reading the