Add to the Adventure . inside or out . with the customizable . Simplay3 Young Explorers Modular Play System offering 12 unique possible configurations! The customizable Young Explorers Modular Play System Playset from Simplay3 is made up of the Young Explorers Indoor/Outdoor Adventure Climber . Discovery Playhouse and Activity Climber. Each play unit can be enjoyed by itself – or joined to one or two of the other units to add to the adventure and build an even bigger play system. Twelve different playset configurations to keep the fun fresh. Each set is sturdy . easy to assemble . sanitize and care for . and is recyclable.