Actually, this game is more of a Don Doko Don clone than a Bubble Bobble or Fairyland Story clone, but I'm sure most of you understand where I'm coming from regardless.
As for which game I'm talking about in the headline and sentence above: The Berlin Wall.
Specifically, I'm talking about the 1991 Game Gear port of this Kaneko-developed and -published quarter-muncher.
I'm not sure how or why, but I only learned about this game last week while perusing my bank account's least favorite website ever (aka eBay).
The premise of this single-screen platformer, for those of you who are in the same pixelated boat: Players are placed in the shoes of a boy who must use his hammer to break the blocks that form the platforms that fill each stage. The resulting holes act as traps for the many enemies (including penguins and porcupines) that patrol said stages--as in, after a baddie falls into a hole, the player can bop them in the head with his hammer and send them crashing into the platform or floor below.
Strangely (or not, if you're at all used to the single-screen platformer genre), that last bit causes the defeated enemy to transform into various power-ups and food items that can be collected.
As is the case with many of these Bubble Bobble/Don Doko Don/Fairyland Story clones, The Berlin Wall is almost insultingly easy at the beginning but the difficulty quickly ramps up--about halfway through the second world, in my opinion--to a level that can only be described as "maddening."
A little trivia for anyone who cares about such things: Kaneko basically re-skinned and re-released, in 1992, this game for the Sega Mega Drive. Called Wani Wani World, this single-screener stars a green crocodile who wields his/her hammer against a bevy of platform-stalking baddies.
See also: 'You say Bubble Bobble clone, I say Fairyland Story clone'