[quote:yhs8f2x2]I deleated all behaviors of the match 3 objects
I have add events that makes the match 3 objects falling down
That's pretty much it !
Basically, for such a constrained layout, you don't want to rely on complex behaviours ; these are good for platformers, top-down shooters, physics objects where you need the collisions when you can't predict the outcome, etc. but here you'd fight the behaviours to make them do what they're not really good at.
Also, you don't even need the collisions for clicking objects, you can just use "on mouse click" + "if mouse overlap" > action. Actually maybe a "draggable" behaviours would be better, depending on your game.
Anyway, don't use any platform or physics or anything. You can for example have a representation of your grid/board in a 2D array, and run logic on the data in the array to detect when symbols are aligned, when there are holes and other blocks need to move, etc. Then the game you present to the user just becomes a visualisation of the data in the array.
At first, don't bother with sliding symbols, etc. just do simple straight cell swaps on a timer (i.e. symbols instantly "teleport" to the next empty cell when moving down). When you've got that working, you can add some variables and basic math logic to make the symbols "slide"
A Match-3 game can sound simple, but unfortunately with WYSIWYG tools like C2 the built-in behaviour don't help you that much. You can achieve a clean nice result but implementing basic logic yourself.