10 Worst Multi-Phase Video Game Boss Battles

10. King K. Rool - Donkey Kong 64

King K. Rool is Donkey Kong 64's final boss, but rather than simply have Donkey Kong go toe-to-toe with him in a boxing ring, players have to take part in a five-phase boss fight where each of the playable Kongs must beat him in turn.

Though each of the phases changes up the gameplay a little, some majorly frustrating constraints are enforced upon the player, namely a tight 2.5-minute time limit per round.

If you can't drain K. Rool's health in that time, the round will restart with his health restored, all while the player's isn't.

Worse still, you've only got 12 rounds to complete the five phases with zero checkpoints. If you fail or any of your Kongs loses all their health, you'll have to start the entire boss fight again.

Considering that even a good run through the battle takes close to 20 minutes, it can take hours to beat this thing, especially as the final phase ratchets up the difficulty considerably.