I've been trying Nipple% lately and I am wondering what is up with that rock that gives you coins in the dino cave. Is it about positioning or is it just rng how many coins you get out of it?

That is currently a mystery to all of us

Just confirmed it doesn't work on version 1.0.0 so make sure your game is updated

How often did you try?

100 tries at least and i got 8 coins every time. Updated the game and got it 2nd try

Btw, is every rock that throws out 8 coins when you break it with the T-rex, just totally random how much it gives you? because mostly I just get about 24 and sometimes I get about 50 from the 3 outside.

You can get consistent at getting 48 coins, at least from this rock. This makes the cave faster than Bowser's Kingdom