Five Nights at Treasure Island: Found Wikia
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Checking the Meat Freezer is much more important now. If the red humanoid figure in it appears at your right door and the lighting changes, you must shut off the power. Once the power is off, you have to use your flashlight with [CTRL] and use [SPACE] to shine it brighter to stop some suits. If all else fails, click it or hide. Also, be careful for the regular Oswald, he can sprint to the office in the Meat Freezer if you are not careful. Finally, NEVER SHUT OFF THE MEAT FREEZER UNDER ANY CIRCUMSTANCE!
— Night 4's hint text

Night 4 is one of the nights in Five Nights at Treasure Island: Found.

Unlike Night 3, this night will not end at 3AM. This night drastically increases the difficulty as most of the characters become active at this point. Acephalous and Suicide Mouse are much more active this night as well as all the previous suits. "God" becomes a threat this point on and may continuously enter the Office in a short period of time. Photo-Negative Minnie and Willy are also active this night, as well as Daisy Duck sometimes. The player should also be cautious about Oswald as if they don’t watch him carefully he can easily catch the player off guard. The player must also constantly check the Meat Freezer to slow down Undying's movement, as when it enters the Office, the player has no option but to turn off the power, and the player must not watch the cameras too much as a requirement for Willy, or else he will enter the Office, which the player must shut off a camera to avoid him. God calls you on this night.

Phone Call

*Quacks and Interferences* You took it... *Old Style Music* We want it back...(Loud) back...(Echo) *Quacks and Interferences*
— God

Active Suits

The only active suits and humanoids on this night as of the current update are Photo-Negative Mickey, Oswald, Disembodied, Acephalous, Suicide Mouse, Photo-Negative Minnie, Pluto, God, The Face, Undying, Willy, Oswald and Daisy Duck (and Acephalous's Head if Purity's spawning ability is counted).