If, when you throw some gems back up, you create a "match" of 3 or moregems in a vertical column, they disappear (with a cool little explosion).At this point, if there are any "matches" of the same gem to the left orright of this column, they disappear too! And so on. This is great forcool chain-reactions! You also get more points for the more gems thatdisappear in a match. (Matching four gives as many points as matchingthree twice, for example.)