Board Thread:Eureka Moments/@comment-27904998-20170101054545/@comment-29785768-20170101062138

Yes, the special gem combined with a line-clearing gem is really powerful, if you can engineer it. But I always avoid combining with a bomb because it never used to work. Sometimes it just treated the bombs the same as normal gems, other times it caused some sort of glitch that prevented you finishing the game (I play on an iPad). It's too long ago now, so I don't remember exactly what the glitch was, but others reported it too, here on the Wikia.

Maybe the glitch has been fixed now?