Mr. Do!'s Castle

The goal is to destroy all deadly unicorns by crushing them with blocks or knock out all the blocks featuring a cherry symbol. Alternatively, collecting three key blocks will unlock the castle roof door, which becomes temporarily harmless when accessed. Collecting letter-containing unicorns will earn you letters in the word EXTRA, while successfully spelling the complete word grants an extra life.

The game features several block types, including ones with skulls that, when knocked out in pairs, remove all blocks between them and replace them with bridges. As you progress through the castles, the layout becomes trickier, with faster and more numerous unicorns to contend with.