When a column contains five gems and another gem is added, the column is destroyed and your mine cart gets damaged. Three of those column destruction will end the game. If you match four gems, you will create a mini bomb that explodes in a three x three pattern. Use them to create space when things are getting tight. Matching five gems will make a mega bomb, which explodes in a full five x five space. If you drag a mega bomb to the middle of the mine cart, you can clear the entire space. Double tap to activate your hand brake bombs to destroy all the gems in your mine cart and slows the speed for a few seconds. Use this when you need to recover from a constant rush of nonstop gems.