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The Arcade Portal was obtainable in Season 25: "Pixel Arcade" by reaching level 3.
Arcade Portal as of recently has been getting rarer over time as it initial hype from a while back faded into irrelevancy, allowing it to be comparably as forgotten and hard to find as stuff like Walk of Fame or Beach Hammock.
Supply is widely distributed — no single holder owns enough to register as a hoarder.