Halfway into the first half, Luke Le Roux was shown the red card.
That expulsion felled Varberg Bois.
Then it came loose for Häcken.
Benie Traore made it 1-0 in the 26th minute.
From the penalty spot, Alexander Jeremejeff shot in 2-0.
Then Tobias Heintz solved 3-0 in the 37th minute.
Varberg had a tough time with a man sent off.
But with a quarter left came a reduction.
Simon Adjei pushed the ball in from eleven meters.
It was Häcken's first win of the season.