If your query refers to downloading levels (the "exclusive 300" levels), this typically happens within the game itself: Smartphone App for Super Mario Maker 2

While there is no official mobile port, you can experience similar Mario gameplay on mobile through:

Since there is no mobile version, the only legitimate way to play is on the Nintendo Switch .

The product you are looking for—" Super Mario Maker 2 Mobile 300 Download Exclusive "—is not an official Nintendo release. Super Mario Maker 2

Here’s a useful, engaging text tailored for a hypothetical “300 Download Exclusive” event—perfect for a community post, Discord announcement, or fan site update.