Red lights

A DC gave me a new world. I tried it out for the first time today and here was my experience. The world seems to have been a sort of game. The world consists of one main room (large square room) filled with several side rooms. About 3 side rooms on 3 of the sides and no side rooms on one. That is 9 total rooms and one full wall. The rules of this pocket world were this. 1, The only way to enter this world is by entering a invalid URL into any electronic device, doing so will take you to the game's webpage which will change your location to the game room. 2, To leave the world, you only need to tap an iPad on the wall between the doors 3, There are two types of entities in the world, one are players, those are standard dream characters. Second are monsters, those are summoned by players through the use of playing cards 4, Monsters may use magic and abilities while players have about the same amount of usefulness as humans. Players need monsters to defend themself's. 5, Players may use side rooms to face each other while players in the main room may fight "waves" of enemy monsters. Now, here are my experiences. I get gifted this world by a dream character, I do not remember the details. The world was filled with about 30 people in the main room and 2-3 people in each side room. The main roomlooked like a dance hall. I first moved through each side room introducing myself and asking about the world. When I was done, I entered the main room and the first battle started. I reached into my pocket and found cards with other dream guides and "main characters" that I met a long time ago. I pulled each of them and they spawned in. They fought the many other beings with their magic and attacks. They were not easy battles and I could only have 1-2 monsters active at once. After two battles, everyone was preparing for a third. About 20 seconds after the second wave ended, the room got very dark and I could barely see. The dance hall turned into a blank black walled room. There were dark red glowing lines all over the black walls and there was no light and I could not see anything but the dark red glow of the walls. All I could hear was the other players monsters dying. I panicked and tried to attack but to no avail. Just then, a song started. I realized that I needed light and I flipped through my deck of cards revealing nothing. Once I hear the song, I know what to do. At this point, I become lucid and I sit down on a imaginary bench and start playing a piano I made out of light. After I hit the climax of the song that was playing, the room lights up and a new door is revealed. I open the door with my song and pull the DC out that caused the attack. All of the players crowded around me wondering how I broke the rules of the world. At this point, I decide to leave the world to do other LD stuff. All in all, the world was fun and I think I will visit it later.