How To Play

Goal

Rebuild the collapsed apartment building by placing the correct numbers into the correct cells as fast as you can.

Start a Round

1. Choose Practice (3x3) or Pro Level (5x5).
2. Press START.
3. Wait for the collapse animation to finish.
4. Drag number tiles into the building cells.

How Clues Work

Colored clue tags between neighboring cells tell you how the two hidden numbers combine:

• Red = addition
• Blue = multiplication
• Yellow = subtraction (larger minus smaller)
• Green = division (larger divided by smaller)

Use these relationships together to deduce exactly which number belongs in each cell.

Scoring and Time

• Correct placement: the number locks in place.
• Incorrect placement: +30 seconds penalty.
• Final score is based on completion time.

Controls

• Repeat: restart the current puzzle.
• Exit: return to the home page.
• Play Again: start a new puzzle after you finish.

Tip: start with cells that are heavily constrained by nearby clues, then use elimination to finish the board.