This article presents a review of existent literature that provides insight in the effectiveness of computer learning games. Based on this research, the effectiveness of games is illustrated in detail with regard to three current perspectives on games: design characteristics of games, the process of gameplay and the reflection of specific objectives and outcomes. Although, all perspectives are connect with the hope of better learning through games, it is criticized that the effectiveness cannot be simply answered by one of the three alone. The goal of the article is therefore to clarify the different views. To further advance game research and design decisions, recommendations are proposed that include research on and alignment of individual learner factors, game design and learning outcomes. (Contains 1 table.)