"Things that collide are a quite common thing in video games. How do they sound, though? Bouncy balls colliding with each other? Hard blocks falling on the ground? Stuff that crash when they hit other stuff? How about the player falling on a springy-item that pushes him back into the air (super-mario-style)? Well, not to worry, we got you covered!"
make sure to check out RETRO COLLISIONS - SOUND EFFECTS PACK here:
Also here is a complete audio preview!