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