make a particle emitter (just an emitter or do it from an object, whichever one is going to work for you)
then select the particles and add a gravity field
make your stairs or whatever they will bounce off and go Soft/Rigid Bodies > Create Passive Rigid Body
select the particles, shift select the stairs, and go particle>make collide
and the particles will collide with the stairs and bounce
although, doing just that wont get you the effect of what you see in the video but it's a start
you can change the particles to spheres and give it a per particle colour (requires an expression i think)
you can change the friction of the stairs
ummm, not too sure where to go from ther, you'll notice that the spheres will intersect with the stairs though, i think you can change that somewhere, something to do with an offset attribute in the connection between the particles and stairs.
uhhh, i would point you to a tutorial but i dont actually know any...
you could try searching for
particle emitter rigid body collision tutorial
that could help?
that's a "Ch" pronounced as a "K"
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