The title of the world's longest indoor slide currently belongs to a massive stainless steel spiral tube slide located at the 89 Mall in Kuwait City. Verified by Guinness World Records, this slide has an official length of 85.02 metres (approximately 279 feet) and a total height of 32 metres. Riders begin their descent from the seventh floor of the shopping centre and navigate four helixes to reach the ground floor. For safety and comfort, the slide features a perforated upper shell to allow for airflow and visibility, preventing a feeling of total darkness during the high-speed ride. While the "Slide@T3" at Singapore's Changi Airport is a famous 12-metre high-speed airport slide, the installation in Kuwait holds the global record for sheer indoor length and verticality within a retail environment.
As of my last update in October 2023, the title of the longest indoor slide in the world is held by:
“The Slide” at the MSG Sphere in Las Vegas, Nevada, USA.
It measures approximately 400 feet (about 122 meters) long and descends from the top of the arena’s interior down to the main concourse level. The slide is built inside the venue’s atrium and is part of the visitor experience at the MSG Sphere, which is known for its massive immersive screen and advanced audio-visual technology.
Record titles can change as new attractions open. If you’re looking for the absolute current record, I’d recommend checking recent updates from sources like Guinness World Records or major travel/attraction news, as new large indoor slides may have been built since my last update.