Jewelanche

Everyone now knows the three-similar-shapes-in-a-row formula. However, Jewelanche is a fun variation of it. How is it like to be jeweled The jewels are dropped in a haphazard manner, and the laws of physics take over. You still need to make chains of three or more, and the bigger the better.
Chain combos will give you gems, with which you can buy power-ups between levels. But if you don't manage to clear it all, the jewels will keep piling till the screen is filled, and it's game over.