It's Checker. Just one. Not much else to say.
Developer Credits#
As with many Nice Code games, pressing Up, Down, Up, Left, Right, Left, B on the menu will briefly display a credits screen. Nature Color Game is one of several aliases used by Nice Code, and PJ most likely refers to the Power Joy series of Famiclones which many Nice Code games have been released on.
Revisional Differences#
The game was also released as Checkers in both NES and VT03 formats. The NES version appears to be almost identical, but the code to access the credits screen was disabled and the music was removed from this version. Additionally, the A button is used to start the game instead of Start, and the text on the right-hand side was altered.