Reflecting Dlareg

When he finished counting, a door-sized mirror appeared on the wall. As he'd placed his hand where it was to be, it also ended up touching the surface of the mirror as well. Upon his contact, there was a brief resistance, as a solid object does, then his hand could sink through. Once he had stepped into the room, the mirror would fade from the outside wall so no one else could stumble upon it.

The large room was lit by torches and otherwise empty, except for a door on the other side. Not far into the room, the floor stopped being typical Hogwarts stone and instead were strange yet big squares. There was a significance to them, though their meaning wasn't clear until he noticed writing at his feet that gave a brief explanation of how to proceed.

When Gerald stepped into the square, it changed colour to signify his level of danger or safety. There was some sort of magical field keeping him on that square, making it clear that he'd only get to stand on one per row. Now he had to make his next choice, and hope he didn't get any dangerous ones.

He was, once again, on a cautionary tile. Gerald was making progress, but he'd need to land on a safe tile soon or his luck might run out.

Once again, he'd landed on a cautionary square. It was fortunate that he had enough squares coloured now that he had a better chance of predicting which squares are safe, and he had a feeling that was needed more than ever now - if his next step was going to be something that wasn't dangerous. At least he knew the safe squares were all connected in a single step's reach.

When Gerald stepped onto the square, there was a WHOOSH of blackness blasting from the also-black square. It felt like he was floating or drowning, which was a confusing combination of sensations. His mind became foggy and he didn't know where he was. As if there was nothing.

Then it was over, and Gerald found himself laying on the floor in front of the door he had used to enter the room. The path he had created so far faded back to regular stones. There was a magical sort of shifting and he just knew that the entire path had been reset. It seemed that "Game Over" actually meant "Start Again". So now he was, quite literally, back to square one.