As you all know through most games you face super powerful enemies which you sometimes have to beat in a specific ways and then get a reward which then you have to use to progress through the game. So who do you think was the most annoying bosses of all time, ones who takes you ages to defeat.

1) Metroid prime from....... metroid prime. I know bad title for it. This boss has two stages for it. I know not many but on the first he is colour coded.... yes that's right colour coded. As in you have to use the different beams you have collected throughout the game to injure him with you having to switch about 50 time in the intire thing. Finally his second and last stage he turns into some ghost form thing when you have to jump in these pools of phazon and let power you up to blast the crap out of him. 

2) Is the last boss in ninja gaiden. Cant remember his name so sorry. By now in the game you would be tired enough beating the other bosses as this is really the hardest game in the WORLD. The guy is weilding the dark dragon sword which the whole game set you out trying to stop him form obtaining. Yep you failed and now you have to kill one of your best friends now that he has become and dark evil jerk. So geneally goes around wipping of any damage you deal to him with him dealing about 3 time more to you. Sometimes he jumps on the ledge where you cant get him where you have to TRY and dodge his fireballs which is about impossible.

Couldnt get an image sorry.

3) Finally the only other extremely hard boss i could find. To be honest i dont think this boss is possible as he can kill everyone of your characters in one go even at maximum level. So yes the ultimate, all powerful and unstoppable.... Ruby weapon form final fantasy 7. All i know about this is that you hurt him normally but he has literally millions of health and has about unlimited stregnth. How you can possibly beat him i do not know.