Documentation OpenTD guide Use this guide to learn the OpenTD API concepts and syntax through a series of example C# programs. 2025 R2 92.0.0.0 2024 R2 OpenTD reference Download this API reference for a comprehensive list of all OpenTD API types and methods. 2025 R2 - Net4 2025 R2 - Net8 92.0.0.0 2024 R2 OpenTD demos Download this Visual Studio C# project showcasing multiple usage scenarios with the OpenTD API. 2025 R2 Net4 92.0.0.0 2024 R2