If you use the videos linked below, you will be at ~70 minutes ( you can see statistics for every level and overall any time in level select )
Great Tip:Each time you move on special plates ( key, elevator up+down and that ones which change the setting of the level ) , you will waste some seconds.
Hit
( Pause ) on these plates the instant you roll on them, the game will pause, but the action the plate does, will be done while in pause.
Some Timelimit-Level are realy non-forgiving if you even waste 1 second, so try this method, it saved me dozen of times.
The MasterKube achievement in Cubikolor worth 342 pointsWin 150 red medals (complete 150 levels in Hardkore mode)