Cube Tower Stack 3D is a free online 3D stacking game where you guide your character across platforms, building block towers while collecting coins along the way. Built in Unity3D, the game runs smoothly in your browser with no download or install required. Your main goal is simple: stack as high as possible without losing your blocks and reach the end of each level intact. At the finish line, you hit a 7-step multiplier sequence that can seriously boost your coin total, so getting there with a tall stack really pays off. The game features 9 unlockable characters to collect, giving you a solid reason to keep grinding coins between runs. Each level tests your timing and movement control, since sloppy stacking means fewer blocks and a weaker multiplier at the end. The casual pace makes it easy to pick up, but landing a clean run and maxing out the coin multiplier keeps things satisfying. Cube Tower Stack 3D is a great pick for fans of casual 3D games, block stacking games, and Unity3D browser games. If you enjoy free online tower building games, coin collecting games, or simple skill-based mobile-style games you can play on PC without downloading anything, this one is worth your time. Short sessions, quick restarts, and that multiplier chase make it genuinely hard to play just once.