How to Play 67 Stack: The Full Rules

67 Stack is one of those games that looks almost too simple in the first five seconds and then quietly takes over your whole afternoon. A block slides across the screen. You tap. It drops. That is genuinely the entire control scheme. But the tower you build with those taps gets more demanding with every single block, and understanding the rules properly is the difference between a tower of four and a tower that scrolls off your screen.

Here is the complete rundown so you walk in knowing exactly what you are doing.

The one and only control

You do not steer the block sideways. You do not aim it. The block moves on its own, sliding back and forth across the top of your tower, and your only job is to pick the moment it lands. On a phone or tablet, you tap the screen. On a keyboard, you press space or enter. That is it. One input, used at the right instant, over and over.

Because there is only one action, 67 Stack turns into a pure timing game almost immediately. There is nowhere to hide bad timing behind clever strategy.

What happens when you drop a block

When you tap, the moving block falls straight down onto the block below it. Whatever part of the new block lines up with the block underneath stays. Whatever hangs off the edge gets sliced away and tumbles off the tower. This is the core mechanic of the entire game: every drop either keeps your tower's width intact or shaves a little bit off it.

Line up a drop close enough to the edge and center of the block below, and the game counts it as a perfect drop. Perfect drops keep the block at full width, which means your tower does not shrink, and they trigger a small bonus, more on that in a separate article about the 67 combo.

Land badly enough that almost nothing overlaps, and there is nothing left to stand on. The tower topples and you get the "Timber!" screen.

The blocks alternate between 6 and 7

Every block that slides in is labeled with either a 6 or a 7, and they always alternate. If the block you just placed was a 6, the next one sliding in will be a 7, and vice versa. This is not just decoration. Landing consecutive perfect drops as the labels swap between 6 and 7 is exactly what triggers the game's signature 67 combo callouts, so pay attention to the numbers as you play, not just the shapes.

Height, score, and the camera

Your height counter ticks up by one for every block you successfully place on the tower. Your score climbs too, with a flat bonus for every landed block plus a much bigger bonus for perfect ones. As your tower grows the camera quietly pans upward to keep the action in view, so you always have a clear read on the current top block even when your tower is dozens of stories tall.

One detail worth knowing early: the game gives you a short beat right after a new block appears before your tap actually counts. If you mash the button the instant a block spawns, nothing happens. That tiny buffer exists so a leftover tap from your last drop cannot accidentally end your run on the very next block.

Speed ramps up as you climb

The sliding block does not move at a constant pace. The higher your tower gets, the faster the block slides back and forth. What felt like a lazy, readable swing at block five will feel like a blur by block thirty. This is the game's real difficulty curve, and it is the reason a tower that looked unstoppable early on can suddenly fall apart near the top.

Game over and your best score

When your drop misses badly enough that the block cannot balance, the run ends immediately. The game shows your final height and score and compares it against your personal best, which is saved so you always know the number you are chasing.

Now you know every rule there is. The only thing left is reps. Play 67 Stack and start building, and if you want to trade tower heights or ask other players for tips, jump into the chat on the home page. Curious how your score stacks up against everyone else? Check the leaderboard next.