If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
This is a match three game where you can't change positions of the objects, but need to look for groups of 3 or more adjacent equal objects and click on them. Once you do it, the objects disappear and the free space is filled by other objects that fall from above. If there were any tiles under the disappearing gems, the tiles will be broken. When all tiles on the screen are broken a key and a key hole appear. You need to eliminate all gems between the key and the hole to make it fall there.
This game is played with mouse only.