If you are old enough to have been into Bionicles in 2001, then you may remember the Mata Nui Online Game. If not, then you can download and play it here: http://www.bionicleonlinegamesarchive.weebly.com
You should also download the walkthrough on the same site. This site has just about all the online Bionicle games there as well. They will have most of the games I talk about. The games they don’t have are the ones you have to buy (yeah, that would be illegal!), and 6 mini-games from Metru Nui. Some other good ones (not quite as good as MNOG 1, however) are Mata Nui Online Game 2, Matoran Escape, and Inika Island Assault.