Fics like The Gauntlet

They were there, and then they were gone. While enjoying the cheap beer and amusements offered by a pop-up fair in their local park, the Matsuno sextuplets stumble upon The Gauntlet: a run down tent filled with stained mirrors and costumed actors being sold as a haunted house. Nothing remotely scary about it. But when they're split up and sent through, the younger three never come back out. Now the older brothers must race against the clock to save them, but the hall of mirrors is treacherous and full of hidden dangers. And there is no guarantee their little brothers will still be alive by the time they find them.

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