It was immediately heated when the prime ministers bumped against taxes.
But the climate problem and especially the price of petrol led to harsh words between Stefan Löfven (S) and Ulf Kristersson (M).
"The promise is not insignificant, you promised not to raise the petrol price, you promised not to levy taxes on work, you broke those promises," Kristersson said.
Stefan Löfven said that the biggest reason for the high petrol price is production and demand is increasing.
"There is nothing political – if you do not plan to go to Opec," he told Ulf Kristersson.
Agreement on migration?
Ulf Kristersson said in advance that the problem of migration is one of the most important for him to debate in the evening.
In the duel he said that "Sweden must have the courage to reconcile co-responsibility for a broken world with responsibility for the integration challenge in Sweden". Stefan Löfven said he would also like to see a broad agreement on migration – but he wants to wait for EU legislation on this issue.
"I find it unrealistic to outsource Swedish migration policy to the EU," Kristersson said.
"Now you are a candidate for a prime minister and you say that it does not matter what the EU agrees, I think it would be a good thing if the EU pursues an equal migration policy – then other countries will be forced to take a different responsibility, replied Löfven.
The Swedish image – black or white?
In the issue of the image of the country they both want to govern, it was freed in Ulf Kristersson's interview with the Financial Times.
An interview that Stefan Löfven was noticeably upset about:
"You do not describe their country that way, it's an overthrow," he said.
Ulf Kristersson said that the prime minister's remark was "great".
"Should I say something to Swedish media and something other than Financial Times?" Their readers are mature enough to hear the truth about Sweden, about all the good and all that is really problematic.
Stefan Löfven then asked if he was blind to the problems in Sweden.
– We are dealing with the problems. There have been too few investments for eight years and it is clear that the differences are growing, he says, and refers to the former government.
Much laughter for a personal quiz
Despite the high tempo and the sometimes harsh tone, the mood evolved when the party leaders set aside their dividing lines and answered questions about each other.