There are three secret areas in Scrabania and one in Paramonia, all four of them in the temples. Did you find them? (In Paramonia, look behind
those big rolling boulder thingies, and in Scrabania try
going down lifts you can't initially go down, and
pushing against left walls). Unfortunately you don't get the hints for secret passages like you do in Rupture Farms (like the sounds made by mudokons and obstacles that are offscreen but not in the normal neighbouring screens) so you just have to keep your eyes open, look in shadowy corners and for foreground items covering the path at the edge of the screens. Also, trust your natural curiosity.
Those are hints if you want to find them yourself. Otherwise, check the walkthrough