Web-based games and simulations are becoming popular because they are easily accessible and are mostly hardware independent. This gives scope for improvements for the field of game development from a Web perspective. The Game Engine of this paper is proposed and developed to meet the increasing needs of a more straightforward way to develop Web-based 3D games and other visualizations. The Game Engine of this paper is made using certain existing tools such as three.js. The Game Engine gives flexibility to users by combining physi.js objects and three.js objects and introduces new classes of objects and also supports particle systems providing good control to developers without compromising performance. The Engine also features a HTML5-based editor that lets developers to give more prominence to game logic. This also streamlines the development process by splitting up the tasks among various streams of development.