Who's at the Door?

Knock knock. Who's there? Better check… then CLOSE IT. DuoDoor is a door-closing reaction game built around the hinge of iPhone Duo. Your phone is the door. Unfold it to peek inside, and if something nasty lunges at you, fold it shut as quickly as you can. Your reflexes are timed to the millisecond. KNOCK. PEEK. FLINCH.

Listen. Someone is knocking from inside, and you'll hear and feel every knock. Unfold your iPhone Duo to slowly open the door. A burglar? A raccoon with your keys? Wait for the lunge, then fold the door shut. Just Nana with cookies, or the pizza guy? Leave it open. Closing the door on friends gets you a cheeky comeback, not a score.

TIMING IS EVERYTHING Close too early and you lose the round. Too slow and it got you. Some villains are only bluffing and never strike, so closing the door the moment you see a scary face won't save you. Only a real FLINCH scores, timed to the millisecond.

TWO WAYS TO PLAY Knock Knock! Endless rounds of knocks, peeks and quick closes. Keep chasing a faster time. Flinch Three A daily challenge: three FLINCHes, one run a day, and your best time counts. Come back tomorrow for another go.

MEET THE NEIGHBORHOOD A hand-illustrated cast of 15 callers: Pizza Pete, Cookie Carol, Officer Dana, Troop 42 and more, plus a rogues' gallery of Bandit the raccoon, Sticky Fingers, the Porch Pirate and The Auditors. Study them in the Who's Who yearbook before you open the door.

SEASONAL SURPRISES At Halloween the regular cast steps aside for trick-or-treaters: ghosts, a little witch, Frank and a black cat. But keep an eye on the sky. When the UFO shows up, the alien never bluffs. At Christmas the room gets a wreath and festive decorations.

COMPETE WITH YOUR FRIENDS Game Center leaderboards for Fastest Close and Flinch Three Your own top-10 fastest door closes A history chart that shows your reflexes improving over time

BUILT FOR THE FOLD Made for iPhone Duo's hinge. Folding and unfolding is how you play. Turn on the live hinge-angle readout to watch your door open degree by degree Rich haptics, knock sound effects and a cozy soundtrack The room switches between day and night with Light and Dark Mode Supports Reduce Motion

NO FOLDABLE? NO PROBLEM. DuoDoor also plays on any iPhone. Swipe the door open and tap to close it. Free to play. One optional purchase removes all ads for good on every device signed in to your Apple ID. Quick reflexes, a jump scare, and a lot of laughs. Can you close the door faster than your friends?