10 Video Game Bosses You Can Trick Into Killing Themselves
4. GLaDOS (Portal)
Mastering the portal device in the Portal series is one of the most satisfying things you can do in life, allowing you to solve even the most confounding of puzzles by teleporting about the place and using the environment to your advantage.
These portals don't just come in handy during regular gameplay, either: they're key in helping you to defeat the first game's final boss, the cold, calculated, and menacing computer system known as GLaDOS.
When the battle starts, you'll have to grab the purple core that GLaDOS drops, and pop it into the nearby incinerator. This will annoy the already quite angry robot even further, causing her to start flooding the chamber with a deadly neurotoxin. On top of that, she'll start firing missiles at you, which will obviously hurt if you take a hit. But by using your portals, not only can you avoid this damage altogether, you can actually send the projectiles directly back to their source, tricking GLaDOS into damaging herself.
Line up your first portal so the missile goes into it, then line up your second portal so it's aimed at GLaDOS, and the explosive will rocket straight into her annoying metal frame. Do this enough times and you'll beat her, without ever firing a shot yourself.