Only in Japan!
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Blocky is an enemy in Densetsu no Starfy 4 which hides in a block. It looks like a regular block, but continuously takes a moment to peer out of it before returning back in. If the player moves directly underneath or above Blocky, it will cause Blocky to jump up and attack, provided that it is in a close enough range to see the player. Defeating it gives a single Pearl, without the need to defeat three enemies in a row.