In 2009, Chucky's house in Orlando was more original with a lot of other evil toys, while Hollywood decided to make Chucky's Funhouse which used the House of Horrors space similar to Face Off and Universal Monsters Remix. There was more Chucky and no other "Universal Monsters" in the space for the 2009 HHN Hollywood season.
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I know some Horror Nights fans are "tired" of Chucky, and while he has been featured in multiple different Horror Nights, I think that idea that Chucky has not gotten a maze/house sense the 2009 (outside of the "IP era" and also one that is not in Japan) has made other Horror Nights fan saying that he is not used enough. I do understand both sides.
To keep this conversion going in the direction of "Biggest Horror IPs yet to appear at HHN," I think it's important to note that while Chucky has been featured, never has there been a "Child's Play" related experience that let's you relive the original film.