海腹川背

Umihara Kawase is the first game in the series released in 1994 for the Super Famicom. Umihara Kawase contains a total of 49 fields of which four are exit fields and six are boss fields. The game makes good use of the SFC's colour palette for digitized photographic backgrounds. The rope physics sometimes strain the Super Famicom's CPU, leading to slowdown, but this is rare. The game permits saving speedruns, establishing such play as a principle feature of the series. The game, along with Shun, was ported for PC in 2015. The slowdown from the Super Famicom version is no longer present though the game remains largely the same with the addition of a practice mode.