1. Introduction of the game:
Five Nights at Freddy's 3 is a survival horror game developed by Scott Cawthon and is the third installment in the popular Five Nights at Freddy's series. Released in 2015, the game continues its story with the same blend of tense atmosphere and jump scares that the series is known for. Set 30 years after the events of the original games, players take on the role of a security guard working the night shift at the horror-themed attraction Fazbear's Fright, based on the unsolved mysteries of the former pizzeria's animatronic entertainers.

2. All characters and levels of the game:
The primary antagonist of the game is Springtrap, the decaying animatronic inhabited by the spirit of a former serial killer. Phantom versions of other Five Nights at Freddy's characters, such as Phantom Freddy, Phantom Chica, Phantom Foxy, Phantom Mangle, Phantom Balloon Boy, and Phantom Puppet, also appear as hallucinations that disrupt the player's efforts to monitor the attraction. FNAF 3 unfolds over five nights, each increasing in difficulty, with the addition of a 6th "Nightmare" night and a secret 7th night with customizable difficulty settings.

3. What attracts users most to the game:
Players are drawn to Five Nights at Freddy's 3 for its intense psychological horror elements and the sense of helplessness it instills. Fans appreciate the evolution of the gameplay, which introduces new mechanics like audio and ventilation systems to manage while keeping an eye out for Springtrap. The game's enigmatic backstory, steeped in mystery and hidden lore, also adds depth and engagement, encouraging players to piece together the dark history of Freddy Fazbear's Pizza.

4. Why it is popular:
The game's popularity stems from its unique blend of horror, challenging gameplay, and an engaging storyline that is revealed through environmental clues and minigames. The fan community thrives on unearthing the game's secrets and theorizing about its cryptic plot. Its popularity is bolstered by Let's Play videos and streamers who share their experiences and reactions online, contributing to a widespread cultural phenomenon.

5. When the game was released and how many versions are currently available:
Five Nights at Freddy's 3 was released on March 2, 2015. It is available across various platforms, including Windows, Android, iOS, PlayStation 4, Xbox One, and Nintendo Switch. As of my knowledge cutoff date in 2023, these constitute the primary versions of the game, alongside regular updates and patches that have been released to address bugs and improve the gameplay experience.

6. The most difficult part of the game:
The most challenging aspect of Five Nights at Freddy's 3 is managing the faulty systems of the attraction, such as the audio, camera, and ventilation, while keeping track of Springtrap's movements. As nights progress, system malfunctions become more frequent, and the pace of the game intensifies, requiring quick reflexes and strategic planning to prevent jump scares and ensure survival.

7. Strengths and weaknesses of the game:
The strengths of FNAF 3 include its atmospheric tension, innovative gameplay mechanics, and the continued development of a compelling and intricate storyline. The use of audio cues adds a layer of psychological horror that is especially effective. However, weaknesses cited by some players include repetitive gameplay elements, less variety in animatronics compared to previous games, and potential frustration with the difficulty of later nights.

8. What other games have been developed by the same developer:
Scott Cawthon is the developer behind the entire Five Nights at Freddy's series, which includes multiple sequels, spin-offs, and prequels such as Five Nights at Freddy's: Sister Location, Freddy Fazbear's Pizzeria Simulator, and Five Nights at Freddy's: Help Wanted, among others. Scott has also developed other games outside of the FNAF franchise, including titles like "The Desolate Hope" and "Chipper & Sons Lumber Co."