They have just put up 20 unanswered points to overturn a 24-7 deficit and inch into the lead.

Field goal - 49erspublished at 02:17 Greenwich Mean Time 29 January

02:17 GMT 29 January

Detroit Lions 24–27 San Francisco 49ers

Jake Moody makes no mistake this time as San Francisco make it 20 unanswered points and with just under 10 minutes left in the game they finally have their first lead of the match.

Brocky Purdy hasn't been sacked tonight until now - as he's taken down twice on consecutive plays! Detroit are lucky to get away without a flag for roughing on the second hit but it's some welcome relief for the Lions as San Francisco will have to try the field goal.

Image source, Getty Images

Brock Purdy takes off again and again he's not sliding but taking the contract head-on as everything gets laid on the line in the play-offs.

George Kittle takes just his second catch of the night 28 yards to rumble down to the Detroit 27 - the tight end's been in blocking mode mostly tonight but is a huge threat in the receiving game if cut loose.

Image source, Getty Images

Greg Olsen, former NFL tight end on Fox: "It just shows how fast things can change in the NFL. The value of every possession is critical and none more so than now in the fourth quarter.

"Each team has to take advantage of possessing the ball and maximise every opportunity."

Image source, Reuters

Magic from Brock Purdy!

The Niners QB somehow scrambles away from two certain sacks and manages to find fullback Kyle Juszczyk out on the touchline.

What looked a loss became a first down.

A couple of runs later from Christian McCaffrey and we are heading for the final quarter all square.

Ben Collins
BBC Sport

Wow, what a turnaround!! There was just two minutes and 15 seconds between those two touchdowns.

In fact, the 49ers wiped out a 17-point deficit in an eight-minute span. And now the momentum is entirely with the home team.

Can Detroit halt it? The stage is set for a thrilling finish as the sun sets on this season's NFL play-offs.

Image source, Getty Images

Oh boy, a second costly drop from Josh Reynolds who looked a shoo-in to convert on third and long.

Remember he dropped the four-and-two early in this half when Dan Campbell opted not to kick a field goal.

A huge punt from Jack Fox is inadvertently taken into the end zone by Chase Lucas and it'll be a touchback for the Niners.

Everything going their way at the moment.

Former NFL tight end Greg Olsen on Fox on how Detroit can get back into the game: "You've got to be careful you don't just go into a shell - the stadium's come to life and the momentum all seems to be with San Francisco, they've [Detroit] got to get back to those big plays over the middle."

Brandon Aiyuk may well have changed this game with his amazing catch that not only set-up San Francisco's first TD of the second half but also really got the crowd jumping.

It's been all San Francisco since he took this incredible rebound catch.

Image source, Getty Images

Image source, Getty Images

Image source, Getty Images

Seventeen unanswered points so far from the 49ers in this quarter.

A bruising eight minutes for the Lions.

The crowd have woken up at Levi's Stadium.

Brock Purdy sells a clever dummy and is on his bike with a 10-yard pick-up.

Deebo Samuel is the first to attempt to close off the drive and drags it down the one-yard line.

On the brink of another touchdown here.

Horror show for the Detroit Lions!

Their run game has been magnificent today but Jahmyr Gibbs doesn't have a tight grip when he is tackled by Tashaun Gipson.

The ball is recovered by the 49ers' Arik Armstead on the 25-yard line. A prime chance to tie it up.

Here's one for you - these two teams met in the 1957 play-offs and the half-time score that day? 24-7, exactly the same as tonight.

The difference being that San Francisco led in that game but ended up losing 31-27. Will there be a comeback again tonight?

Phoebe Schecter said the Niners needed to get Deebo Samuel and Brandon Aiyuk involved (01:25).

They've done that in some style in this third quarter.

Former NFL tight end Greg Olsen on Fox: "That's a big-time drive there by San Francisco, spearheaded by two monster plays by Brandon Aiyuk."

Wow, Brandon Aiyuk has got himself a 54-yard pick-up - and in the weirdest fashion.

Brock Purdy takes a shot downfield, Aiyuk bundles into Kindle Vildor and the ball bounces off the cornerback's face mask for Aiyuk to catch. Brilliantly.

He falls to the ground a mere four-and-a-half yards short of the goalline.

What a stroke of luck for the 49ers to get themselves back into this game.