Berlin no Kabe (ベルリンの壁), called The Berlin Wall internationally, is a 1991 arcade game by Kaneko ported to the Sega Game Gear exclusively in Japan the same year. A Sega Mega Drive port was in development but would be reskinned into Wani Wani World. Likewise a North American Game Gear version was advertised, but cancelled for unknown reasons.
Each level consists of ladders and platforms. Each platform can be broken with your hammer (). The goal of each level is to try to get the enemies to fall into the holes. When an enemy falls into a hole, you have a limited time go to that enemy and hit it again to destroy it. The level ends when all enemies are destroyed. recreates blocks you already destroyed, in case you get stuck. At the end of every level you can go to a shop to buy things, a quick bonus stage, and then a boss.