Plot hole: Spoilers. It's revealed that the barn game takes place at an old farmhouse owned by the family of Jill Tuck - Jigsaw's widow. It's public knowledge that she was married to Jigsaw and that buildings they owned served as the headquarters of several past traps, so the barn should have been investigated at some point in the meantime. Ten years have passed. It makes no sense that the barn was never investigated and that the bodies of the barn victims were never discovered.

Jigsaw (2017)
Ending / spoiler
Directed by: Michael Spierig, Peter Spierig
Starring: Tobin Bell, Callum Keith Rennie, Hannah Emily Anderson, Matt Passmore
A new killer replicating the style of John Kramer, the Jigsaw killer, emerges, leading detectives on a hunt for a copycat. Meanwhile, four people are trapped in a barn as a result of the terrible things they did. One by one, they meet their maker at the hands of the traps each must escape. It turns out that the scenes in the barn happened ten years earlier, long before the events of the first Saw film. The mastermind here is Logan Nelson, a forensic pathologist who set everything up to get back at Detective Halloran, whom Logan knew let true criminals walk free, including the man that murdered Logan's wife. Logan gets Halloran to confess before leaving him to die.
Trivia: Tobin Bell is the only actor to appear in all eight "Saw" films.
Question: Why was Edgar asking for Halloran on the roof? Was that his game where he had to kill Halloran or trigger the remote?
Answer: Spoilers: As revealed at the end, Halloran is a crooked cop who has a past connection to Edgar. Edgar therefore wanted him there, since he presumably assumed Halloran could help him out of this jam. It's also possible that Edgar's tape instructed him to find Halloran, but we can't know this for certain, since it wasn't on-screen.
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Suggested correction: The game was unknown to police even 10 years after John died. Now they've found all his other games and his multiple lairs. There would be no need to continue the search.
Ssiscool ★
Hogwash. They would have definitely searched known properties associated with Kramer and his family.
I agree. In the second Saw movie, the police discover that John Kramer is Jigsaw. With this knowledge, not only would the police be able to freeze his assets but, they would be able to look into his financial records and look into any properties he owns like houses, warehouses, etc. Since the cops now have a face and a name, it's a very big plot hole why they never searched his home or any other places. If they had, more traps would have been found and confiscated.