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Saw II - timeline
April: Daniel Matthews survives the Nerve Gas House with the help of Amanda Young. His father, Detective Eric Matthews, investigates and ends up being locked up in the bathroom from Saw, not knowing that Daniel is safe.
April: A snitch named Michael is killed by the Death Mask.
April: Obi kidnaps criminals and puts them in an abandoned house for Jigsaw. He ends up becoming part of the game.