READ THE INSTRUCTIONS CAREFULLY!: Use the arrow keys to move: Up Arrow to go forward; Down Arrow to go backward; Left Arrow to turn left; Right Arrow to turn right. Find the key. You have unlimited time for it. And then go to the place where you will find the door on the mini-map. Get the crystal and go to the yellow line(door) in the bottom left corner of the mini-map. For that you have 20 seconds. Focus on the Timer (seconds) after you have picked up the crystal. Keep an eye on the mini-map. If you get stuck anywhere, then turn yourself and when you are able to see a little black dot, press the Up Arrow key, otherwise, restart the game(I am extremely and sincerely sorry for this issue). Other instructions you will get in the game itself.
I would like to thank Coding with Chris for this video: https://youtu.be/mzznRhUA1Tk Watch the video if you want to make this game (or another 3D game) Map idea, story, crystal, doors, key: My ideas.