Playing a lot of souls games, it's really funny when they've got invisible fences that reset them back to their spawn point or when they get hung up on a rock or something that they should easily be able to path around. There were quite a few fights where I just didn't feel like doing the fight because it looked annoying. Sooooo....

In Enter the Matrix for PS2, there are two levels where you're riding in a car and have to shoot the enemies chasing you. For some reason, the enemies are only programmed to shoot when you're looking at them. So you can just look at the ground the whole mission and you'll win, even on hard mode.

Hitman has some complex AI with a lot of interactions that, in context, do make a lot of sense. One that’s a bit rarer is the way they react to gunshots, which I used to get a Silent Assassin Suit Only run.

There’s one path with two guards and I couldn’t figure out a way around. My master plan had me stand in a room nearby, and fire an unsilenced pistol at the ground twice - no one saw, but the two guards heard and became alerted to the location. I holstered the gun, and snuck around their pursuit path to go in the area they’d protected.

As a bonus, several NPCs inside the room would normally have been “suspicious” of my appearance. But, while they’re panicking in reaction to nearby gunfire, they are more concerned with avoiding danger than spotting intruders (kind of makes sense, they think I might be someone running from the shooter too). So, I rushed past them to a safe room before any of them returned to a calm state.

And, since no bodies were found and I wasn’t spotted doing anything, the whole loud chaos doesn’t cause problems for my silent assassin score, ironically enough.

In Pokémon Red/Blue, enemy Pokémon have unlimited PP and trainer Pokémon will always choose their move based on type alignment. Psychic moves are super effective against Psychic Pokémon. Recover is a Psychic type move. You can't run from trainer battles.

So, if you're in a trainer battle against a Pokémon that knows Recover, and you only have Psychic type Pokémon, the enemy will use Recover over and over until you eventually run out of PP and Struggle to death or turn the game off.

In Horizon: Zero Dawn you come upon a quarry and a quest asks you to go in and... I can't remember. Save someone? Check what's going on? When I stumbled upon this quest, I was severely underpowered and could get that boss down in that quarry.

But I soon found out that said enemy wasn't able to pathfind its way to the way leading down to the quarry although it was still considered part of the arena. Also there was much cover there.

In the end, I stuck to said path, sat behind a rock and just put a fuck ton of arrows onto the boss until all my resources and its healthbar were depleted. Took me way too long, lol.

In Crash Bandicoot: Warped, in the first boss fight against Tiny Tiger, there's a spot you can stand that's completely safe. This isn't that interesting by itself. But, in the remaster, if you stand in this spot, a crowd of NPCs will throw wedges of cheese at you 🧀

In Baldur's Gate: Dark Alliance for PS2, every single enemy in the game, even bosses, can be cheesed by walking circles around them. I'm pretty sure this applies to all games made with that engine (Champions of Norrath, Fallout: Brotherhood of Steel)

In CoD Black Ops Zombies, on Kino, there's a spot you can stand on the theater stairs where you're completely safe from dogs. We used to abuse this spot when we needed to take a break during long online sessions.

In Assassins Creed Black Flag, I ran into an optional encounter with a unique hostile ship that I was completely unprepared for, as I hadn't spent any money on upgrades for my own ship. So I tried to quit and reload. Well, the game autosaves at the start of the encounter. So I turned around to leave - and I get desynchronized. Great. I love being locked into optional unbalanced content!

So I had no other choice than to try to play the encounter. Except even with good positioning it was unbeatable as they had mortars, and a single broadside would melt my ship. But... there's one special cannon attack aimed straight ahead. It does almost no damage, but stuns the enemy ship for as long as it takes to reload. There's no way to turn fast enough to use any other weapon though. So I just plonked behind him too close for the mortars, and kept stunning this huge ship with the same attack for about 15 minutes, so it was never able to hit me with anything. We just sat there, neither ship moving or using any significant attack, until the 890th small cannonball upon which it suddenly burst into flames and sank.

I completed Drakengard for PS2 a couple days ago.

I'm sorry for your loss. XD

The one I remember best is how I found out how to cheese Final Fantasy Tactics' battles for lots of xp. Not really "breaking enemy AI", but mechanic abuse, as the speed buildup meant the last enemy (which I would intentionally leave alive for as long as I needed) would only get its turn after each of my own dudes had like 3+

In many real time games, the easiest way is to abuse enemy pathfinding. My most recent case is with Palworld: most enemies just try to make a straight line towards you, build anything and they often won't be able to properly hit you. A lot of pal skills ignore ground and cover, tho, so there's that. This works better with human enemies.

A similar case of pathfinding abuse I often did was when I played Sea of Thieves. Get skellies to follow me, get back to my ship, blast them with a cannonball or snipe them. Easy. Too bad I always sucked at properly aiming and hitting other ships

My reaction times are really bad now, so I struggled hard with Sekiro. But by chance, I discovered a specific series of movements and jumps that would usually get enemies to attack backwards instead of forwards.

I repeated that 100x per battle, sneaking attacks in when I could, healing when I mess it up, and finally winning through sheer perseverance. I achieved the normal ending without ever "getting good".