Domino sleeping until it hits another domino

[Sharai]

Here is my solution.

Main operator here is PhysX Collision that triggers particles when they collide (and send them to be active).
And it has very handy option "future collisions" that I increased to 5, and it predicts future collisions, otherwise, dominos would always sort of freeze in each collision, while detecting themselves (make a zero that option, and you will see what I mean).

Hope it helps.

Thank you, that very help.