An excellent multi-player game called Crowd City was built on the .IO platform needs you to run around, find other players, and then invite them to join you.
Instructions for Crowd City
Crowd City was developed by VOODOO. Your mission is to establish command over some flesh-eating zombies and populate your army with people who are still alive. When the size of your zombie army is sufficient, you can begin to wage war against other zombie armies. It's possible that there are a lot of other gamers in your region, and they're all working towards the same goals that you are. It is possible that you will be able to transfer inhabitants from your group to another player if your group is larger than the other player's group.
Tip and tricks
You'll start out as a lone human. Your primary focus should be on the white folks that are located throughout the city. They will shift to the hue of your group and join it if you go physically closer to them. You can determine how many members are in your group by starting at the very top.
Choose between two-dimensional and three-dimensional graphics to better your display.
It does not require an internet connection to play, and it is completely free.
The gameplay is simple and intuitive.
Try to get higher on the leaderboards than your buddies!
Crowd Run 3D: navigate your way through a number of challenges.
Crowd Pusher: navigate through various challenges while collecting mathematically-based power-ups.