Throw blocks at the city to make larger numbered blocks.
If you hit two blocks with the same number, they will merge and double in size!

If you drop a block to the bottom, it will be collected.
Tap the star in the upper left corner of the screen to go to the collection page.

Special Items
1. Wild block
It is a 4-colored block.
It combines with other blocks.
For example, if you hit a block of 4, it will merge into a block of 8.

2. Center block
It is a block with a picture of a clay pipe on it.
The block you hit will fly to the center of the city. Protect the blocks you don't want to drop by hitting them.

3. Destruction block
It is a block with "TNT" written on it.
It destroys the block you hit. Use it with care.

The number of blocks is up to the 29th power of 2. I don't know what will happen if you make more than that...
If you have unlimited time, give it a try...