Anonymous

In this context, 'ever' isn't necessary for the simple meaning, but it does add a great deal of emphasis. The person wants to know what the first game was EVER, in all of history.

Anonymous

The very first video game in the world.

Anonymous

through all possible time.

Anonymous

It is giving a time frame. Ever means all the time. Just like if you said last year it would mean last year. If you said 20 years ago it would mean 20 years ago. But you said ever it means means since time began

Anonymous

ever means the first.