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Stack Up

About this game

Test your timing by building the ultimate colorful tower. Tap the screen or press Space to drop sliding blocks cleanly onto the stack. Perfect placements trigger satisfying musical notes and expand your block, while overhangs get chopped off until one wrong move topples it all!

Controls

Drop block: Tap or click anywhere · Space or Enter

How to play

A block slides back and forth above your tower. Drop it so it lands on the block below. Any part that hangs over the edge is sliced off and falls away, so the next block is only as wide as what's left. Miss the tower completely and the game is over. Your score is the number of blocks you've stacked.

The blocks speed up as the tower grows, from a gentle slide at the start to a fast sweep after about fifty blocks.

Perfect drops

Land a block within a few pixels of the one below and it counts as a PERFECT: nothing is cut off and you hear a musical note. Perfects in a row climb a scale, and from the third one in a row your block starts growing back toward its original width. A long perfect streak is the only way to recover from early mistakes.

Tips

Watch the block's edge against the edge of the tower below, not the middle of the block.
Blocks alternate between sliding in from the left and from the right. Get into a rhythm instead of reacting each time.
A thin tower isn't lost. Slow down, go for perfects, and it will widen again.
Scores go on the shared leaderboard, so enter a name when you set a good one.