It's a very fast-paced game and is quite difficult. Though sometimes rocks spawn inside eachother and it becomes impossible to win one. But besides that, tricky and challenging game!
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You cold fix it by checking if the spawning rock is colliiding with an already placed rock or is in a ceratin radius of it. If it is, it chooses a different position to spawn. It repeats that until it has found a place with no rocks underneath. My recommendation... A way would be to use Colliders as triggers for the rocks.