To "resist" is not exactly futile, cos you'll be exploding four blocks of the same color or shape. There's even a nice combo system that will up the ante just so. Here's the list of combos:
* the classical : blocks explode, those above fall and connect, combo!
* the explosion : the blocks take some time to explode and during this moment you can add other blocks to make more combos
* the cooldown : after an explosion, a small amount of time is given to make blocks explode somewhere else, if you do it before the time is elapsed, you make more combos.