One of the best things about Granny 1 is the sense of tension that builds up as you're sneaking around. You never know when Granny will show up, and it's hilarious when you manage to dodge her just in time. The game also has some pretty funny moments, like when you're hiding in a closet and Granny starts searching for you!
The game's replay value is also pretty high, since you can try different approaches each time you play. You might want to speedrun it, or try to find all the hidden items. Either way, it's a blast to play, and you'll want to come back for more!
How To Find & Use the Master Key ( Granny version 1.5 ) - YouTube