Squire set that up with a huge burst on his Super Rugby debut. Then Cruden kicked across field, where Tikoirotuma challenged Buckman for the ball. It bounced clear for Ngatai to scramble over in the corner.
Cruden now with the chance to put the Chiefs ahead.
The kick is just inside the right sideline, so it will be tricky.
But Cruden makes it. 21-19 to the Chiefs with 10 minutes left.
Now can the champs hang on?
The Chiefs claim the kick-off cleanly and set about their work.
Nanai-Williams kicks into the Highlanders' half where Ben Smith takes.
The Chiefs' defence passed a serious examination last week, now they have another small lead to hang onto.
Scrum for the Highlanders as both halfbacks are replaced.
Huge pressure on the scrum but the Highlander hang on, allowing Sopoaga to clear.
Lowe loses the ball forward and the Highlanders will have the scrum on halfway.
Just over six minutes remain for the Highlanders to conjure something.
They're hot on attack now, about 30m out.
Highlanders into the 22 now. Big test for the Chiefs.
Stanley stabs through a kick for Fekitoa but it barely bounces into touch.
Lineout for the Chiefs, 10m out from their line.
Clean ball from the lineout, with Liam Squire claiming it.
Kerr-Barlow - back on after a blood bin - with an average kick that finds touch inside his own 22.
Highlanders now with another chance after taking the lineout.
Highlanders down to five metres out before the ball bobbles clear.
Chiefs now kick deep into Highlanders territory and Lowe puts on some pressure to force a mistake from Sopoaga.
He's bundled into touch and throws away the ball to give the Chiefs a penalty.
Cruden kicks for the corner and the Chiefs will hope to keep the game down there.
Only they lose it almost immediately from the lineout.
Highlanders scrum, inside their own 22, with two minutes to play.
Highlanders spreading the ball just in front of their own line.
Shane Christie loses it in the tackle and that may be curtains for the Highlanders.
Penalty Chiefs, bang on their 22. 30 seconds remain.
The clock has been stopped as we await the Chiefs' decision from the penalty.
Given they have only two tries, they may opt for the kick as it would probably eat up the remaining time.
Actually, the penalty has been revoked after the referee checked upstairs. The Chiefs still have the scrum feed.
Chiefs just need to put it out now.
And they do it to clinch another tense victory.
That's two from two for the Chiefs as the defending champions go straight to the top of the New Zealand conference.
They've been made to work awfully hard for both wins but champion teams are those who can grind out victories.
Cruden says the crowd helped the Chiefs home. He thinks their attack improved from last week but it was again the defence which earned the win.
Thanks for joining me, guys. Impressive stuff from the Chiefs and they'll head into their bye week full of confidence.
Stay tuned for Gregor Paul's match report from Hamilton.