An Easter egg is an intentional inside joke, hidden message, or feature in a work such as a computer program, video game or DVD menu screen. The name is used to evoke the idea of a traditional Easter Egg hunt. They allow the player to find more secrets and other things in the game.
There are many easter eggs in the three games in the series. This page contains a list of the Easter Eggs from Five Nights at Wario's, Five Nights at Wario's 2, and Five Nights at Wario's 3. Some Easter Eggs may be hallucinations.
Wario-Man is a recurring Easter Egg in the series. He does not attack the player. In the first game, he can be seen in the Bathrooms flickering the camera feed. In the second game, Wario-Man will rarely appear for a split second in the player's vision. He appears during the storm. In the third game, he appears on the stairs in Living Room 3.
Clicking the poster that reads "Wario Ware" in the Corner of The Office in Five Nights at Wario's 2 makes a laugh which resembles Wario.
He will occasionally look through the window in the Tool Storage. It is unknown if his appearance has any meaning to the current story.
Death Phone Call
There is a special call that might happen after a character kills the player in Five Nights at Wario's 2. This is a hint to the true side of Phone Guy.
Mario's hat may appear at the upper floor of the Staircase.
When the player hides in Living Room 3, a book is on the table. Clicking it will reveal a short story of Toad's job in WarioWare Inc.