I've noticed (and gotten into) a couple of secret rooms, in particular in Level 5 and Level 6. In Level 5, there's a room hidden just past the big laser barrage, near the branching green drone track threatened by a laser. This room has a static model of a CLARC in it, that it seems like you can't interact with.

In level 6, shortly after you flee the first TankBot and plug in the drone, in the room where you have to bend a laser around a big barricade using several angle blocks, there's a second laser sensor that can't be reached with the laser. If you can activate the second sensor, opening a room that contains... nothing but some scenery.

These secret rooms are clearly puzzles (so I've tried to avoid spoiling them above), and accessing them takes the same intent and planning as any other CLARC puzzle, but I can't identify any purpose for them. There's no secret dialogue or other action that results from getting into these rooms.

Anyone find any other secret rooms? Or have any idea if these rooms have a purpose besides being extra-tricky to get into?

[Edit: image uploads not working and not enough rep to post links, sad trombone.]