A RPG, where you traverse Mata Nui as Makuta, corrupting Rahi and fighting hordes of Matoran. Each toa would be a boss, and when you beat all six, you must stop Takua from becoming Takanuva.
The sequel would be a prequel, where you must defeat metrutoran, team up with dark hunters, and fight the Toa Metru. The tutorial would be a boss fight with Lhikan.
The third installment would be very different. Instead of playing as Teridax, you would play as the Piraka. You must defeat the toa nuva first, then the toa Inika. The final boss would be with Axxon or Umbra.
In the fourth installment, you would play the Barraki. You would team up with Gadunka and other sea creatures to stop the Toa Mahri from breaking the cord between Voya Nui and Mahri Nui.
In the fifth installment, you'd play as Icarax, and team up with other makuta to stop the toa Nuva from opening the Codrex and awakening Mata Nui. The final boss battle would be as Antroz in the Jetrax, fighting Pohatu and Lewa.
In the sixth and final installment, You would play the first half as Tuma. You would gather an army of Skrall to fight the other tribes. The final boss would be Mata Nui. The second half would be about Teridax. You would build upon your Skrall army with Rakshi and Skakdi to take out the rest of the Glatorian, Tahu, and Takanuva. The final boss would obviously be the prototype robot.