All the mario sports games for the gamecube, and all the smash brothers, borderlands one and two (havent played pre sequel yet). The above games all need to be played with others to maximize their fun For solo i would say, fallout 3 and new vegas (havent played any others, got into it late), oblivion and skyrim i could play over and over and still have fun. All of the fire emblem series that have been released in north america (except for shadow dragon), and final fantasy advance tactics 2 for the DS. I have also had a lot of fun with halo and minecraft, i would lean towards putting these as classified as playing with a group but i have had a lot of fun solo as well, but i would say i have had the most fun with these when it is me and one other person.