Making a match-3? Read this:

Miscellaneous Forums/General Discussion/Making a match-3? Read this:

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Grey Alien
 #1
http://greyaliengames.com/blog/match-3s-in-the-bfg-top-100/

If you are making one for commercial reasons then make sure it's the best match-3 ever. If you are making one for fun/learning, then no worries! :-)