Stack Up Support

Questions, problems, or ideas? Email [email protected] (yes, that's the right address for Stack Up too) and we'll get back to you as soon as we can.

Helpful things to include: your device model, iOS version, and what you were doing when the problem happened.

How do I play? Drag a piece from the tray onto the board. Fill a whole row or column and it clears. A shadow on the board shows where the piece will land, and the number above it shows the points it will score.

What can stack on what? A 1 and a 2 make a 3. From 3 up, a tile on its twin doubles: 3 on 3 makes 6, 6 on 6 makes 12, and so on. Nothing else stacks: not a 1 on a 1, not a 2 on a 2, and never two different numbers from 3 up. Every square a piece covers has to work, or it won't drop.

Why won't a piece drop? At least one of its squares is over a tile it can't stack on. A red ring shows which one.

How are points scored? Every square you fill earns a little, stacking earns the number you make, and clearing a line earns all the numbers in it. Clearing several lines at once, or clearing on turn after turn (a combo), earns much more. Empty the whole board for a big bonus.

When does the game end? When none of the three pieces in your tray fits anywhere. You can revive once per game, which clears the three fullest rows, or use a power-up to make room.

How do power-ups work? You earn one every 10 lines you clear, and can hold two of each. The Hammer smashes a tile, the Splitter halves a tile of 6 or more, the Wild upgrades a tile where it stands, and Undo takes back your last move. Tap an empty power-up to watch a short video for one.

What is the Daily? One puzzle a day with the same pieces for everyone. Your first finished game each day counts for the Daily leaderboard; replays are practice. Power-ups and revive are off in the counted game so it is fair for all.

I find dragging hard. Turn on Tap to Place in Settings: tap a piece, tap a square to see where it will go, then tap the same square again to place it. This also works with VoiceOver.

I bought Remove Ads and still see ads. Open Settings and tap Restore Purchases. Remove Ads stops the ads between games and makes revive free; videos you choose to watch for power-ups stay available.

How do I change my ad privacy choices? Open Settings and tap Privacy Choices (shown where the law requires it), or use iOS Settings › Privacy & Security › Tracking.

Will my progress follow me to another device? Not at present. Progress is stored only on the device you play on. Game Center scores and achievements follow your Apple account.