Ultimate Custom Night (UCN) is the definitive Five Nights at Freddy’s mash-up—an intense, sandbox-style survival horror game by Scott Cawthon (released June 27, 2018) .

🎯 What Is UCN?

A point-and-click horror where you configure up to 50 animatronics (from across the franchise) and set their aggressiveness level (0–20).

You then survive a custom “night” in an office by managing doors, vents, AC, heater, music box, power generator, laser traps, Faz-Coins, Pirate Cove curtains, and more.

Includes 16 themed preset challenges, voice lines, cutscenes, unlockable office skins, and a prize counter for purchasing bonuses.

🧩 Gameplay Mechanics

Combine iconic mechanics from previous titles: camera monitoring, door/vent control, music box winding, mask use, air system management, etc.

DeeDee can randomly activate additional animatronics mid-shift.

Use Faz-Coins to buy power-ups like “Death Coin” to disable animatronics temporarily.

🎮 Features & Platforms

Available free on PC via Steam/GameJolt; paid on mobile (US$2.99) and consoles ($7.99 on PS4, Switch, Xbox).

Mobile version faithfully recreates PC gameplay, though some users report performance issues and control quirks.

🔥 Extreme Difficulty Mode

Known for the infamous “50/20 mode” – all 50 animatronics set at maximum difficulty — a nearly chaotic, iconic challenge.

✅ TL;DR

Ultimate Custom Night is a customizable, extreme challenge within FNaF’s universe—choose from 50 animatronics, configure difficulty, employ all your tools, and survive the night.

It’s a fan-favorite due to its replayability, lore depth, and sheer intensity. The 50/20 mode and voice clips sparked massive community engagement and theories.