Nintendo revealed earlier today that Astral Chain, which releases this week, will have a retro 16-bit minigame, that in-universe is developed by the Ark Police Force to market their mascot.
According to director Takahisa Taura, “There are a variety of missions in #ASTRALCHAIN, including a hidden 16-bit-style minigame. I like it a lot since you can feel some nice nostalgia while you recover mentally from the all the fighting. I hope you’ll try to find it.”
In a separate tweet, Taura mentions that this will appear as part of a subquest, and that this is just one of the various types of subquests that have been implemented into the game.