This action game was originally released in 1985. Players control the protagonist, Jun-kun, to battle against the "Warugaki" gang. However, Jun-kun’s only move is jumping. You must fight by skillfully using the C-SOs, trampolines, and other features placed throughout each stage. When you step on a C-SO, a countdown begins; during this time, any gang member caught in the C-SO can be crushed and defeated. You can also launch chasing enemies into the air by running across a C-SO together. As the game title suggests, mastering the C-SO is the key to victory! Since the gang members' personalities vary by color, you will need a strategy that accounts for their different behaviors. Defeating all the gang members is not the only requirement to clear a stage; you must also collect every target item, such as flowers and fruit. In addition to being a clear condition, collecting these items turns Jun-kun red. While in this state, facing the "Balloon" obstacle character allows you to knock it away and defeat it. Wiping out all the Balloons will grant you a 1UP, but be warned: defeating Balloons this way reduces the points you earn from fruit targets. Whether you prioritize a 1UP or a high score is entirely up to you. *This application does not have a scene select mode. *The main game and gallery screen (*Gallery) are in Japanese version. *Other menu screens and "How to play" screens are in English.