You're referring to "Syobon Action" or more specifically, its enhanced version, often sought after or discussed in gaming communities as "Syobon Action Ultimate".
Many HTML5 versions allow you to play directly in Chrome or Firefox. These are great for a quick hit of nostalgia. syobon action ultimate
(also known as Cat Mario or Shobon Action ) is a notoriously difficult, troll-style 2D platformer that parodies Super Mario Bros. However, "Syobon Action Ultimate" does not appear to be an official or widely recognized version of the game. It may be: You're referring to "Syobon Action" or more specifically,