I just recently started playing bio shock and it was really hard to kill "mr. bubbles" .
Edit: just tempered having to kill 343 :c
What enemies do you have a hard time killing ?
[spoiler]Wake up Mr. Bubbles ![/spoiler]
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Darksouls. First boss. Tried for 30 minutes trying to kill him, then when I realised there is a door to the left side of that room and you weren't required to fight him, I sold the game.