AlphaMagi
Pokemon Master
Towns Folk
SSB Melee was a great SB game but I think that SSB4 takes the cake. The graphics are better, controls are smoother (not that melee's wasn't great.) and there are more challenges than you think!
There are also tons more characters to play as, although I would've preferred it if you didn't start off with so many characters. It make for less unlockable characters.
After completing the first screen of challenges you are greeted with yet another one that contains much harder stuff.