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C So! (シーソー) is a 1985 SG-1000 game developed by Compile and published by Sega. It is a port of an MSX game from the same year, which was published by Pony.
A South Korean company Joy Soft redundantly produced their own unlicensed "port" of the MSX version to the SG-1000 as well.[3]
The game has the player collect various items and defeat monsters by using see-saws. In order to progress, all items must be collected and all monsters must be destroyed. There is also an edit mode, allowing the player to create their own levels. Players can also save and load their custom levels with an attached SK-1100 keyboard or when playing the game on an SC-3000.