Earlier versions (including the Asian version, "Mr. Do! vs. Unicorns
There are no cherry blocks, so hammering all the blocks is NOT a way to complete a level. At the start of each level, normal blocks will appear in the form of 'fill blocks' - those that appear in the later versions after unicorns have refilled holes. In addition, the colors on these blocks change after every two levels.
Later versions :
Normal blocks now have cherries embedded on them at the start of each level. Hammering all of the cherry blocks is a new way to complete the level.
The replay Diamond was added.
Fill blocks no longer change colors after every two levels.