Halo Wars

http://www.google.com/url?sa=t&rct=j&q=halo%2Bwars%2B&source=web&cd=1&ved=0CDkQFjAA&url=http%3A%2F%2Fhalowars.com%2F&ei=NtSqTq2FD6KHsAL7nIDZDg&usg=AFQjCNE0cueR0yMJAsntlAU6h4d93TfBrQ

Halo wars has a great campaign. The  online multiplayer is very difficult. This game is an RTS, so it takes alot of concentration and time. Grapghics are AMAZING.