About Mr. Do's Castle

Operate Mr. Do! by means of the lever.
After dropping a block by use of the hammer, skillfully drop the unicorn into the hole. Then drop the block onto the unicorn and you can exterminate it.
You can also exterminate the unicorn by dropping a block onto it while it is walking.
You can hit and knock over a unicorn by use of the hammer in scenes 1 and 2.
Make good use of the skull blocks, and you can wipe out several unicorn at a time. When dropping both skull blocks, the blocks between them will also drop at the same time.
Only Mr. Do! can remove the ladder.
If Mr. Do! has been trapped between two unicorns on the blocks, you can help him escape by dropping a block with the hammer.
When three of the key blocks have been dropped, the door on the top level will open and a shield will appear. If you wipe it out the unicorns will change to EXTRA.
You can exterminate EXTRA by hammering it or dropping Mr. Do! on it. When it has been wiped out, a flag will be run up on the pole.
Another Mr. Do! will appear if you succeed in running up five flags, EXTRA on the pole.
The last unicorn in scenes 1 and 2, will change and split into the blue unicorns after 20 seconds - after a further 25 seconds, the blue unicorns will split into double unicorns, and then after another 5 seconds these will become eight - there will be no further increase.
Red unicorns will become green if Mr. Do! hits them four times with the hammer, and green unicorns will become blue when he hits them once with it.