The best City Building game on Steam(Opinion). Build your own thriving mega city, or do what I do and put the Elementary School next to the Dump and Coal Factory. Breathe deep children!

Parkouring Space Ninjas with super powers. Enough Said. Warframe has great graphics, both Co-Op and PvP game modes, lots of content and an active community. Free to play so never too late to try it.

It's a Wolf RPG! Create your own wolf, Small and Fast or Slow and Strong. Track and Hunt your prey across the plains. Find a mate and settle down with some pups. Do it all with a friend Online!

The ultimate puzzle game. Design your own Rube Goldberg Machine and challenge others to complete it, or play other's puzzles from around the world. There's also an extensive single player mode.

Mario Maker for PC. You join with your friends and take turns placing deadly traps to make it harder to beat the level. But you must go through your own traps. You are guaranteed to laugh playing this

Multiplayer Tetris with gravity. Try to defeat your friends! Curse them with Icy or Giant blocks to cause their tower to fall as you cackle with glee. They can do the same to you so think fast!

Have you ever wanted to build your own rocket ship and blast off to the moon? KSP lets you do it. You build your rocket your way, for better or worse. Rockets, Jets, Vehicles and even Giant Robots!

Paladins is a great multiplayer game. Think of Call of Duty but everyone has different Comic Book super powers. It's free to play so it can't hurt to try it!

This game is multiplayer puzzle solving at it's best. You and a friend use the Mighty Portal Gun to solve physics puzzles to reach the end of the level. Just don't dump your friend into lava ;)

If you've played Minecraft, you will find this game familiar. Terraria is about collecting resources, crafting equipment and building a base. It's lots of fun to defeat a boss and get his rare loot.