Maybe you have some game idea in mind? Lets start with looking more closely at it.
Each idea can be categorised so let's check it out!
When released, Tetris was definitely something unique and new.
If you'd now do and release a Tetris, you'd be creating Just a Copy.
If you modify or add something new and innovative to the core gameplay, then you'd either be creating it with Improvements or you have combined Something Old with Something New.
Define into which category your idea goes to?