Cruden, who missed most of last season due to a serious knee injury, had a hand in two of his side's five tries and scored another as the table-topping Chiefs overcame a tougher than expected performance from the lowly Blues.
Prop Mitchell Graham, wing Shaun Stevenson, centre Seta Tamanivalu and lock Brodie Retallick all scored tries for the Chiefs, with fullback Damian McKenzie slotted two conversions.