Tetris: Block Deletion (solved)

Hey all!

So. I'm trying to create a tetris-like game. I've got the spawning and the collision down. The thing I'm having the biggest trouble with now, though, is that I have absolutely no idea how to handle detecting if a row is full, and then deleting that row and causing the other pieces to fall.

What I've tried so far is set up "detector" sprites in each 32-pixel tall row, and have them count the number of non-falling sprites. There's ten rows, so when it reaches ten, I tried having it delete the row, and make all of the non-falling sprites become falling sprites, so they would fill in the gap.

Basically, it doesn't seem to be counting correctly, and if I enable the event that deletes blocks, it just goes crazy and deletes all of the blocks.

I don't think I understand unique IDs very well, if that's even the problem. =/

Any help?

Thanks!

Solved. —@

Running into another problem, trying to detect which row contains the lowest amount of blocks. Any ideas?

Have a look a my tetris example on the arcade:

http://www.scirra.com/arcade/puzzle/1259/tetris

There is a link to the capx under the game. Some bits of isn't working right in the latest release of C2 but in general it works correctly.

Thanks!

This was for Ludum Dare, and it's done now, but if I ever decide to go back and improve on it, it'll definitely help.

R0J0hound how add in your tetris game, GAME OVER when blocks touch top of screen?