Key Features of FNaF:

1. Survival Mechanics: Players are required to manage limited resources (like power, doors, and cameras) to prevent the animatronics from getting to them.

2. Animatronic Characters: The antagonists are animatronic characters like Freddy Fazbear, Bonnie, Chica, Foxy, and others, each with their own behaviors and jump-scare tactics.

3. Jump Scares: One of the defining features of the game is its use of jump scares, which occur when the player fails to manage the threats properly.

4. Lore & Mystery: Beyond the gameplay, FNaF has a deep, complex backstory involving haunted animatronics, missing children, and dark secrets about the restaurant’s past. Fans of the series often delve into theories about the lore.

5. Expanding Universe: Over the years, FNaF has expanded into several sequels, spin-offs, books, and even a movie adaptation. Each new installment adds more layers to the game's story and lore.

FNaF Unblocked Games typical is the original versions of Five Nights at Freddy's that can be played on school or work computers where game sites are usually blocked. "Unblocked" games bypass these restrictions, allowing people to access and play the game even in restricted environments.