The features of a website can enhance users' learning experience and facilitate teaching outcomes. In formal online learning, a well-designed multimedia system that is useful as well as offering ease-of-use, can impact on the self-efficacy of learning [13] and game-based learning can benefit learning and understanding and enhance teaching effectiveness [32]. However, since only a few studies focus on website design and informal online learning, it is not well known whether design concepts for formal learning can be applied to informal online learning.