Once in the country unusual tiles, you have no choice but to pass all the tests to get out. For some time the need is to find identical tiles, and only then they disappear forever, leaving the door open. But the problem is that it is not possible to select all the tiles, then there are some locked inside, and their discovery, you must first get rid of those that interfere with the sides. With the approach to the target, they will be placed on each other, so it is necessary to think and do things quickly. Good luck!