“Rainbow Tennis” was actually pretty good, if it’s a reference to International 3D Tennis! The games back then gave a frisson of the glamorous international world of the professional tour by changing the court ambience as follows:

Solid lime green: Wimbledon!

Hard brick red: Roland Garros!

Deep blue: the hard court ones!

Here’s an example of the, at the time in the mid 1980s, some pretty innovative 3D wire rendering in the game: https://m.youtube.com/watch?v=h1JorNBSs4Q