Errors proved costly for the Maroons in what was otherwise an improved and promising performance in Game II, Queensland five-eighth Cameron Munster said.

"I felt like we asked a lot of questions on their right-hand edge, we made a lot of metres," Munster told QRL Media after the Blues secured the series with a 18-14 victory in Sydney on Sunday night.

"At times we didn't execute or get to the end of our sets

"That really hurt us," Munster said.

"We should have been a little bit more patient at times when Jimmy Roberts got sent off."

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Roberts was binned for a professional foul with less than 12 minutes until full-time, leaving Queensland a man up.

Munster said the Maroons had started well, as planned.

"We knew they would come out hard, we knew we had to be better than them, and I felt like we were in the first 20 minutes.

"We just didn't complete and didn't get through our kicks, and around the middle they really hurt us, at times, with their quick play the balls.

"That's something that we need to work on, going into the third game, obviously it's not a decider and they've obviously won the series, but we will go out and do our best for Queensland and hopefully get a win to our name."

Cameron Munster takes on the Blues in Game II at Sydney.
Cameron Munster takes on the Blues in Game II at Sydney.

Maroons mistakes allowed the Blues to fight back from 10-0 down midway through the first half, the Storm pivot said.

"We let them back in the game with piggybacks up our field, in their red zone being offside, and not getting to our kicks, and losing the ball in key areas in key parts of the game.

"We did that in the first game and they made us pay, and they made us pay again tonight.

"We can't do that in Brisbane."

The relatively inexperienced side is rebuilding after the representative retirements of Cameron Smith, Cooper Cronk, Darius Boyd and Johnathan Thurston, and have been without Matt Gillett because of injury.

Munster said he saw signs of improvement from the 22-12 loss in Game I in Melbourne.

"I think we are getting better and better each game, me and Hunty (halfback Ben Hunt) are getting our combinations right.

"I thought we are really good tonight, we just didn't get to our kicks at times, and just errors, they completed more sets than us and got to kicks and made more tackle breaks.

"With their speed in their side they are really going to hurt us if we don't hold on to the ball and put the ball where we need it.

"We are disappointed tonight but I felt like at times we were the dominant side."

The Maroons will be striving to avoid a whitewash in Game III at Suncorp Stadium Brisbane on Wednesday, July 11.