Haneklaus, NilsKaggwa, MaryMisihairabgwi, JaneAbu El-Magd, SherifAhmadi, NaimaAit Brahim, JamalAmasi, AloyceKovacs, Andrea BallaneBartela, LukaszBellefqih, HajarBeniazza, RedouaneBernas, JaroslavBilal, EssaidBituh, TomislavChernysh, YelizavetaChubur, ViktoriiaCiric, JelenaDolezal, ClaudiaFigulova, AndreaFilipi, JanjaGlavan, GordanaGuzsvinecz, TiborHorvath, LaszloJosimovski, SashoKiselicki, MartinLazarus, MajaKazazic, MajaKomlosi, IstvanMaged, AliMashifana, TebogoMedunic, GordanaMehic, EminaMongi, FelhiMtei, KelvinMwalongo, DennisMwimanzi, Jerome M.Nowak, JakubBasal, OqbaQamouche, KhaoulaRajfur, MalgorzataRoubik, HynekSanta, MijalcheSik-Lanyi, CeciliaSippel, MaikeSteiner, GeraldSkorek-Osikowska, AnnaSlavov, AntonSwislowski, PawelTlili, AliTrenevska-Blagoeva, KalinaTschalakov, IvanVlcek, TomasWaclawek, StanislawZlatanovic, IvanMisik, MatusBrink, Hendrik GideonLee, Tzong-Ru2025-11-262025-11-262025-01Haneklaus, N., Kaggwa, M., Misihairabgwi, J. et al. The phosphorus negotiation game (P-Game): first evaluation of a serious game to support science-policy decision making played in more than 20 countries worldwide. Discover Sustainability 6, 1: 1-16 (2025). https://doi.org/10.1007/s43621-024-00693-6.2662-9984 (online)10.1007/s43621-024-00693-6http://hdl.handle.net/2263/105520AVAILABILITY OF DATA AND MATERIALS : The datasets generated during and/or analyzed during the current study are available from the corresponding author upon reasonable request.Environmental negotiations are complex, and conveying the interaction between science and policy in traditional teaching methods is challenging. To address this issue, innovative educational approaches like serious gaming and role-playing games have emerged. These methods allow students to actively explore the roles of different stakeholders in environmental decision-making and weigh for instance between sometimes conflicting UN Sustainable Development Goals or other dilemmas. In this work the phosphorus negotiation game (P-Game) is for the first time introduced. We present the initial quantitative and qualitative findings derived from engaging 788 students at various academic levels (Bachelor, Master, PhD, and Postdoc) across three continents and spanning 22 different countries. Quantitative results indicate that female participants and MSc students benefitted the most significantly from the P-Game, with their self-reported knowledge about phosphorus science and negotiation science/practice increasing by 71–93% (overall), 86–100% (females), and 73–106% (MSc students in general). Qualitative findings reveal that the P-Game can be smoothly conducted with students from diverse educational and cultural backgrounds. Moreover, students highly value their participation in the P-Game, which can be completed in just 2–3 h. This game not only encourages active engagement among participants but also provides valuable insights into the complex environmental issues associated with global phosphorus production. We strongly believe that the underlying methodology described here could also be used for other topics. HIGHLIGHTS • The Phosphorus Negotiation Game (P-Game) is for the first time introduced. • First results from playing in 22 countries with 788 participants are presented. • The P-Game can be played well with participants from various backgrounds.en© The Author(s) 2024. Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.Environmental decision-makingTeachingSerious gamePhosphorusSustainable development goals (SDGs)Article