Aaron Murray’s review published on Letterboxd:
What a ride this film is.
Saw is small. The gore that the franchise is known for is mostly not here.
That's why this movie is incredible.
It mostly takes place in a bathroom with two actors while they solve a series of mysteries surrounding the characters and why they are there.
Without spoiling (although it's hard not to as the twist has made it's way into pop culture) Saw 1 is absolutely incredible. It's well acted, paced, written, shot. It's just utter perfection.