Forza Horizon 5. The game literally throws hypercars at you within the first few minutes. It's fun, although many people complain that it ruins the sense of progression (nevertheless the game has hundreds of cars, unlocking them all would take forever).

Usually I have come across this with poorly done DLCs. They offer some bonus item in game.

So if you buy the game with all the DLC in a sale then when you start the game you have all this extra stuff you wouldn't normally have. I can't recall the game but there was one game where I actively had to not use the DLC items otherwise the first part of the was way too easy and bordering on boring.

Just Cause 3

Get the "Air, Sea, and Land DLC". Start the "Sea" portion. Get the Lightning Gun.

Now play the main missions, you'll feel like Emperor Palpatine with unlimited power.

The Witcher 2, though it’s more of an exploit.

If you get the sword from the Lady of the Lake in the previous game, you start the prologue of TW2 with two silver swords, one being the Lady of the Lake sword. Unequip the Lady of the Lake sword so you don’t lose it to the dragon.

You now have a mid-tier silver sword that is good for half the game. You also don’t need to find a new silver sword at the start of the game.

Bit of an obscure one, but Fire Emblem Gaiden.

There is a miniscule (0.014%) chance for the very first enemies in the game to drop an extremely powerful item that normally isn't available until much later. Getting it early is absolutely wild because one of its effects is doubling stat gains when leveling up, which can quickly snowball your characters into godhood.

it would have to be a fairly atypical sort of game I imagine, most games with a premade tutorial world are not going to have anything too extreme in that world to find, unless its some sort of hidden easter egg. I could see it if its a game that uses procedural generation, but those kinds of games usually dont have much of a tutorial beyond maybe some short instructions.

I guess it could kinda apply in a very mild sort of way in GTAOnline, if you happen to be at the point in the very beginning where youre getting your first car and get free insurance on it, and happen to find one of the pre-customized npc cars that spawn rarely and are still cheap enough to keep after stealing, but those arent really all that rare or special.

Look up the Everburn Blade in Baldur's Gate 3.

Maybe an MMO with world drops?