Bongsil Tetromino

Bongsils spaceship crash-landed on somewhere in desert, and then he accidentally discovered a mysterious ancient city while finding the way escapes. Bongsil started his exploration out of curiosity...
To clear each stage, you need to use the given puzzles to fill empty space. You can move a puzzle by dragging handler which will be shown below while clicking it. Sometime you have to rotate and flip puzzle to fit empty space, so try to be more patient. Good luck!