Game-based learning or serious game is becoming an important trend in e-learning research area because it seems address several typical e-learning problems such as high dropout rates due to frustration and the lack of motivation to continue studying and the cognitive overload of the learner. However, an important problem of serious games is the difficulty for instructors to adapt the storyboard, the scripts and the game levels of the videogame to new pedagogical objectives once the game development is achieved. This paper presents SeGAE, an author-friendly environment that offers to instructors a set of editors in order to modify the game design by defining new characters, objectives, victory conditions, authorised actions among other objects in the serious games even after the development stage. Particularly, we apply our authoring approach on Blossom Flowers, a serious game developed by Ktm Advance. This paper presents SeGAE, an author-friendly environment that offers to instructors a set of editors in order to modify the game design by defining new characters, objectives, victory conditions, authorised actions among other objects in the serious games even after the development stage. Particularly, we apply our authoring approach on Blossom Flowers, a serious game developed by Ktm Advance.