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resolved The battle gets easier as it goes on Videogame
A less challenging, but more realistic gameplay mechanic - an enemy or level starts out being really tough, but, the more you beat it, the easier it gets to beat it even more.
For instance, in a fighting game, hitting an enemy hard early on will make it get dizzy, which makes it easier to hit it, and so on. In a strategy game, attacking an enemy will make it lose resources and the ability to collect resources, until in the end you're just mopping up the last remnants of it. Or, even in a Shoot 'em Up, the boss starts would with dozens of guns, but as you destroy each gun, the fight gets easier, until in the end it's only one pathetic little core shooting an easy-to-dodge bullet.
resolved What trope best covers "game/mod feature breaks AI"? Videogame
In the Civilization IV mod Caveman2Cosmos, there's a special kind of map called a "Space Map". This is, depending on size, an extra-long or extra-tall map which extends the normal playfield to include 11 additional different terrain types corresponding to various different areas of space, whether they be real (the surface of other planets, our Sun, etc.), hypothetical (what lies beyond our observable universe), and fictional (hyperspace). As players progress through the game's ages, they will eventually research technologies allowing them to explore and, eventually, colonize these terrain types, along with developing military units capable of operating on these terrain types.
However, despite the attempts of various developers of the mod, the game's AI is unable to do anything on these terrain types, meaning they're restricted to the "Earth" terrain type and, thus, unable to keep up with the player.
I'm thinking this situation is best covered by Artificial Stupidity, but I'm unsure and would appreciate any suggestions on more suitable tropes.

I know we have this one, I just forgot the name. When a character in a videogame is teaching the player how to do something, they'll say "Press the a button to Y", or even "Press the Y button to Y", oftentimes (but not always) completely ignoring the blatant 4th wall break