Green Dice Inc. (Headquarters: Setagaya-ku, Tokyo; Representative Director: Atsushi Saito, hereinafter "Green Dice"), which operates the experience-based puzzle-solving game brand "Tumbleweed," and Langue de Chat LLC (Headquarters: Shibuya-ku, Tokyo; Representative Member: Hiroaki Hosono, hereinafter "Langue de Chat"), which handles technology development in the puzzle and mystery-solving domain, are pleased to announce that they have entered into a business alliance agreement for the joint development of online puzzle-solving games, effective July 1, 2026. "Nazotoki Game Online" is a platform for purchasing and managing the online puzzle-solving content offered by Tumbleweed. Users can enjoy authentic puzzle-solving experiences anytime, anywhere, from their smartphones or PCs. Through this alliance, by combining Tumbleweed's expertise in creating and operating puzzle-solving games with Langue de Chat's strengths in system development, the two companies aim to expand the content lineup of "Nazotoki Game Online" and further grow the service. ■ Background of the Business Alliance Since its founding in 2016, Tumbleweed has developed experience-based puzzle-solving events with the theme of "one-time experiences." To date, they have produced and operated over 123 original events (as of June 2026), with cumulative sales of take-home puzzle kits exceeding 250,000 units. Currently, approximately 1,000 customers visit their events weekly. In August 2022, they launched their official fan club, "Tumbleweed Nazoclub," offering unique online puzzle-solving experiences and exclusive content. Furthermore, in April 2025, they launched "Nazotoki Game Online," an online service that allows users to easily enjoy puzzle-solving games from their smartphones or PCs, expanding their offerings beyond real-world events. Meanwhile, Langue de Chat, as a technology development company specializing in the puzzle and mystery-solving domain, has been responsible for the system development and mai