A lot of a game’s data is simply models. Games like Tears of the Kingdom cheat by reusing models a LOT. No matter how much a model is used, it only needs to have one file in storage. So the more a single model is used and the fewer total models there are, it can greatly cut down the total file size.
They need to do this because Switch cartridges do have a maximum size. If the game is bigger than the cartridge, you’ll either need another cartridge or you’ll need to download the rest of the game. Nintendo is big on letting people play the game without ever connecting to the internet, so they try to avoid oversized games altogether.
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