- description
- A combination of a [[gameplay-feature:trap-doors]] and a [[gameplay-feature:drop-holes]] — a hinged cover in the playfield that opens to reveal a hole beneath, allowing the ball to drop through. When the trap door is closed, the ball rolls over the surface normally; when it opens, the ball falls in, registering a score or triggering a game event. Unlike a standard [[gameplay-feature:drop-holes]], the opening is concealed until activated, adding an element of surprise to the playfield. IPDB records catalog the feature on machines ranging from early bagatelle tables to mid-century designs, where the trap-door mechanism gave designers control over when and whether a drop hole was in play.