Lots of games have high score boards. It's been a staple of gaming practically since gaming was invented. Old arcade machines let you choose three letters to digitally scratch on the board beside your score and in the modern era a lot of score based games upload your result to the internet, assuring virtual immortality.
And that's neat.
But Zombie Driver stores a player's Slaughter-mode high scores on the internet via Steam. So you can see exactly how well your friends have done on any given map and set yourself a target.
The bit I really like? While playing the game your next highest scoring friend has their name in the upper right corner of the screen, alongside how many more points you need to surpass them.
It's such a small thing to include and many may never even know it's there. But I like it.
Zombie Driver is just $10 on Steam, if running over zombies while competing against your friends is stuff you like.