How do I do a match 3 game?

hello, worst programmer (not even one) here.

After 6 hours of 0% progress I can say that I am stuck at the following point: matching 3 blocks.

My situation: create a grid of 50*50 blocks. (I use 1 sprite, with every frame = another color)

Matching 2 blocks works, but I can't match 3 blocks.

I am looking for some general tips on different kind of match 3 techniques (on how to let the game know those 3 or more blocks are the same and can be cleared).

(for example, I am trying the technique to add invisble extra sprites that can touch other blocks and check if that block is the same or not - or at least I am trying to, but failing somewhere)

Thanks in advance.

If you use search you'll find numerous threads discussing match 3 type mechanics. There is also the following tutorial that may help:

http://gamedevelopment.tutsplus.com/tutorials/make-a-match-3-game-in-construct-2-the-basics--gamedev-8071

Recent topic about matching game:

viewtopic.php?f=147&t=129454&p=911369#p911369

Found good article about deconstruct match game mechanics:

http://gamecareerguide.com/features/140 ... cs_an_.php

Thanks zenox98 and alextro.