Can I create my game using Irrlicht as game engine?
Of course you can, it’s easy. But please note: Irrlicht is not a game engine, it only does graphics. For a game, you need a bit more, like sound output and maybe networking and physics, and tools such as a game level editor. You are free to choose any other library to do this. But to make it easier, there are libraries and tools made by us which are independent of Irrlicht, but easily integrate with Irrlicht engine projects. For example, there is irrKlang, a free 3D and 2D sound engine, or irrEdit, a free 3D world and level editor. See the toolset page, the wiki or the forum for more informations and help about this.