The Inflatable Waterslide is a buildable harvestable that was available during the Summer Pool Party Event. Players are given the Inflatable Waterslide by Rock in the goal Slippery When Wet!. Constructing it requries Beach Balls earned as rewards for cooking dishes on the Poolside Stand or Poolside Grill, and Air Pumps received from friends. The Inflatable Waterslide has 6 stages, each requiring more and .
Unlike previous event-reward harvestables, the Inflatable Waterslide takes much longer to build. While dishes that rewarded Materials for harvestables like the Arc de Triomphe or the Lucky Rainbow yielded between one and four materials per dish, all dishes that yield Beach Balls only give 1 Beach Ball each time they are cooked. However, all of the event-related goals released during the Summer Pool Party Event give 2 Beach Ball upon completion, and many of those goals require the player to cook event-related dishes many more times than past event-related goals did. So while it may seem like Beach Balls are impossible to collect, players should keep in mind that if they complete all of the Summer Pool Party Event goals and fully master each dish they should have no problem obtaining Beach Balls.