Finding the Matrix 11 Train Door code in Stellar Blade will put you through a rather satisfying little puzzle. After fighting for your life against a Stalker Naytiba, it's a nice change of pace.

Matrix codes seemed like a logical choice since they could adhere to any article of clothing and get washed repeatedly but there has to be a more reliable way.

As smartphones have become more and more ubiquitous, so have QR codes. These maze-looking squares are a type of matrix bar code that contains data — usually, QR codes point to a website or open ...