Drop Stack is a free Android game developed by Dave Bollinger. It is an endless stacking game where you tap to drop blocks and stack them up to create a tower. The objective of the game is to stack as many blocks as possible before your tower crumbles.

The gameplay is simple and easy to learn, making it great for quick casual gaming sessions. You can stack the blocks densely for score or drop them into narrow towers for height. Balance is the key to stacking the blocks, so you have to be careful with your placement. The game starts easy but becomes more challenging as you progress.

The controls are super simple, and the physics are realistic. You just need to line up the block, then tap to drop it where it fits best. The game is suitable for all ages, and even a toddler can play it. You can play it anytime, anywhere, making it a perfect game for killing time.