Yes Stack Ball 3D is Safe according to Google Safe Browsing
Stack Ball 3D, Is Stack Ball 3D game Down? Is Stack Ball 3D Down?
Game description
Stack Ball is a 3D arcade game where players smash, bump and bounce through revolving helix platforms to reach the end. Sound easy? You wish!
Your ball smashes like a brick through colorful platforms that block its descent, but if you hit a black one, it's all over! Your ball shatters to pieces and you have to start your fall all over again...