Ok when you unlock The Last Way (beat every 6th stage and beat both dark and hero endings for each-the final boses) make sure your game saved. now go to the 1 player menu and select story mode the you will see a new option called The Last Way! select it and watch the video clip. once the level starts you will see a time limit, but dont worry you can still do the level in that time. when you come to the 1st set of black creatures kill as many as possible because chaos control speeds you up and gets you through some of the level. try and find all the 5 keys because it behind the door there is a warp hole which gets you to the 4th check point. you will come to a place (at least once) with no way out apart from using chaos control. this area is usually has infinte enemies in which you kill until you have full blue gauge and then use the chaos control. use this and you will get through most of the level. the kill the rest of the enemies but when you get to the area with the giants that you can't kill with guns. run through these and you will come to a hill. run over it and you will find black doom. (i will give describtion to help you kill the bos when i found a effective way) hope i helped!