Ravensburger 18000 piece. It took around 14 months : r/Jigsawpuzzles
Amazon.com: Ravensburger Magical Bookcase 18,000 Piece Jigsaw Puzzle for Adults – Softclick Technology Means Pieces Fit Together Perfectly : Toys & Games
CT family of puzzle enthusiasts complete massive 18,000 piece jigsaw
Amazon.com: Ravensburger Castle Through The Seasons 18,000 Piece Jigsaw Puzzle for Adults - 16137 - Every Piece is Unique, Softclick Technology Means Pieces Fit Together Perfectly : Toys & Games
Finished the 18,000 piece Ravenburger " At the water hole" puzzle. Took 6 months to build but it was so worth it. Really impressed by the quality of this puzzle. I highly
Ravensburger - Paradise Sunset Puzzle 18000 piece Jigsaw Puzzle NEW AND SEALED | eBay
Amazon.com: Ravensburger at The Waterhole - 18000 Piece Jigsaw Puzzle for Adults – Softclick Technology Means Pieces Fit Together Perfectly (17823) : Toys & Games
Amazon.com: Ravensburger Paradise Sunset 18,000 Piece Jigsaw Puzzle for Adults – Softclick Technology Means Pieces Fit Together Perfectly : Toys & Games