But I need to consider the possibility that "Pickup 135" is a specific mod or game version. Maybe in a game like "Garry's Mod" or "Steam Workshop" there's a "Pickup 135" mod. Alternatively, it could be a mod for a game that involves pickups, like "Overcooked" where pickups are ingredients, but that seems off.
Wait, "Pickup Truck" games do exist, where players drive various pickups through obstacles. If "Pickup 135" is a specific truck model in one of those, and the cheat code allows infinite money for in-game purchases, that's possible.
Another thought: The user might have confused the game title. For example, "Pickup" as a game could be "Pickup Truck Racing" or similar, and the code "135" refers to the version, level, or vehicle code where "unlimited money" can be activated. However, without specific information, this is speculative.
If it's a game hack, the user wants a guide on how to use an unlimited money cheat code for this game in 2021. Alternatively, if it's a car mod for a game, allowing the player to drive a pickup truck model 135 with unlimited money. But I need to verify this.
But the user included "2021" in the title, so maybe the code was relevant around that time. Perhaps there was a game in 2021 called "Pickup 135" where players used a specific code. However, a quick search in my knowledge base doesn't recall such a game, so it's possible it's a mod or a less-known game.