Ren'Py is a Python-based, open-source engine primarily used for developing visual novels and interactive storytelling, allowing for complex, choice-driven narratives across multiple platforms. Games created with this engine frequently include stat-building systems, high-quality visual assets, and complex, branching decision trees, with notable examples including Doki Doki Literature Club! and Slay the Princess. For more information, visit the official Ren'Py website . The Ren'Py Visual Novel Engine