Crazy Inventor Mahjong

Help the crazy professor to create his next invention by passing a hundred levels of the addictive mahjong. The first levels are rather easy even for the novice but the number of tiles and layers in the pattern increases at the further levels thus the task becomes hard even for the skill master. Match identical tiles to delete them and pass all 20 episodes of the exploration. There is time limit at each level so think quickly otherwise you will have to pass the level again.