Instead of answers like
1. Star Raider
2. Berzerk
3. BattleZone
4. Pac-Man
You should put answers like
1. Star Raider
2. Tomb Raider
3. Star Gazer
4. Star Radar
Now that would be more difficult when you really don't know the title. I got some of them just by easy elimination even though I had no idea what the game was.