Can I make a game with Ruby?

Answer 1

Yes you can, there are many simple ruby library which supports 2d game development, such as gosu, rubygame, which allows for quick development of any simple 2d game (just like pygame, though I seldom use it). They are simple to use and are very proficient in making simple games. However, if you aim to make much complex games or even a 3d one, then ruby is not recommended.

PS: Anyway, I remembered it is both mentioned in gosu and rubygame documents than these libraries are just entertainment software, which means it is mostly used for creating educational/training software or something like that, if you aim to make games for business purposes in the future, i would recommend you to go learn more powerful languages like C/C++, java, C# or lua and so on. On the other hand, if your aim is just to create something that can run and share it with your friends, then go ahead, ruby is capable of doing that.