I've decided not to 100%. I did all of the bonus maps, but the challenges I only did a few of. I knew I would never get the "least steps taken" ones without looking them up so I didn't see a point.

Other than that the game was amazing. I loved the eerie feeling it had, especially once you started to see the deterioration of the facility and pieced together that others had tried to escape. Can't wait to play the second one.