Like the previous game, the story takes place between two movies; Saw II and Saw III. This time around we follow Michael Tapp, son of the last game's protagonist, who in his search for his father ends up in a lethal game of Jigsaw's.
This game has examples of:
- Big First Choice: A decision made early in the game determines who survives at the end.
- Decoy Protagonist: The first level has you play as a character named Campbell. After the first level, however, your perspective switches to Michael Tapp, the son of David Tapp (the protagonist from the first Saw video game, and the cop from the first movie) for the rest of the game.
- Everything Trying to Kill You: The occupants of Jigsaw's game are supposedly all criminals that Michael Tapp's father had put in jail, and therefore don't like you very much.
- First-Person Ghost: There is a brief first person section near the beginning which utilizes this technique. Also when interacting with puzzles and traps, your view switches to a first person perspective. While in this perspective you don't see your body interacting with the pieces of the puzzle.
- Foregone Conclusion: Much like the first game, we all know Jigsaw will still be at large by the end.
- Multiple Endings: The game has two endings, depending on whether or not Decoy Protagonist Campbell survives his final test.
- If Campbell makes it through the Spikes of Doom and enters the elevator, he shows up at the end when Michael makes it to the end of his own Spikes of Doom room, preventing Michael's escape and ensuring his death (since the elevator is occupied and cannot be opened). Jigsaw then congratulates Campbell, tells him that his son is fine (he claimed to have kidnapped him earlier) and allows him to leave. Campbell, traumatized by everything he went through, tries to attack Jigsaw - and falls prey to a trap.
- If Campbell dies, he's obviously not in the elevator, thus allowing Michael to enter the elevator and escape. At the end of his ride, Jigsaw presents him with two doors, just like Tapp was shown. One door has the evidence Michael needs to put Jigsaw away for good, while the other has the pigman costume - implying that Jigsaw is offering Michael a chance to become his apprentice. The screen cuts out before we see Michael's choice.
- Given that Jigsaw is not in prison, we can assume Michael became a pig man.
- Spikes of Doom: Used several times.
- The Walls Are Closing In: Used a lot, adding spikes into the mix.