Challenging in single player. Even more so in multiplayer. WIth more mouths to feed but no more resources to do it, it´s "work together" or die alone

If Minecraft were a 2D-platform with linear progression, you´d have Terraria! Terraria is great for creative building, exploration and fun!

Hands down best 4-man co-op fps game that exists. Plentiful skill and weapon customization so that each member really feels they have a role to fill.

Best turn based strategy game available has great team vs team-play. It's easy to pit new and experienced players together for everyones enjoyment.

Mann vs. Machine-mode is probably the best fps tower defense games available. Stop the machines from detonating the bomb with 6 of your best friends.