What game do you think needs a sequel really bad. There are my choices:

Billy Hatcher and the Giant Egg= HIGHLY underrated. Maybe a sequel will get this game the attention it deserves. I don't know maybe I'm just nostalgia blind. But I don't care PLAY IT NOW!

Dewy's Adventure= One of the best plat formers on the Wii. And with the Wii U's technology then a Dewy's Adventure 2 would freaking rock.

Bonanza Bros= One of the few Genesis games I've played and probably my favorite. A sequel would properly be one of the coolest co-op game ever.

Wii Music= Not sure what you could do with this. Just add more songs, instruments, and modes to play and that would be enough.

Welp Its time for a list.

The World Ends With You - I desperately want a sequel to the best DS game of all time. I don't even care if its a spiritual successor.
Fire Emblem: Sacred Stones - One of the only Fire Emblem games of recent ages without a sequel or prequel.
Ape Escape - After 3 the franchise died out thanks to its rail shooter sequel which was trash. I want a resurgence of this game since its personality is not seen in many things nowadays.
Mech Commander - One of the best labour intensive strategy games I've ever played. You had to constantly be on your toes to maneuver around the numerous hordes of enemy mechs that were obviously better equipped than you. It just stopped at 2 and hasn't seen a sequel since.
Mega Man X: Command Mission - Now I know this is an odd choice, but to me this was one of the better Mega Man X games. It had a well fleshed out story and characters with some intense boss fights. It certainly could have at least a spiritual successor.

and then any of these that I just don't want to write something for because I'm tired:
Sin and Punishment, The Last of Us, Virtua Quest, Time Hollow, Neverwinter Nights 2, Ib, Jeanne d'Arc.

Eternal Darkness II. This needs to happen. Anyone who has seen the "real" ending of this game should agree.

Also, I would like the games after Fatal Frame III to get released in the U.S. Those actually exist, though, so not really relevant to this topic.

List:
Sonic Adventure (we've been waiting for a decade now, Sonic Team needs to stop letting '06 and the Classic whiners hold them back)
Mega Man X (X8 was great! Make this!)
Super Monkey Ball (they need to go back to Monkey Ball's roots, including the art style and challenge factor.)
Street Fighter EX or Fighting Layer (the EX characters were great, don't leave them in limbo!)
Jazz Jackrabbit (the Jazz 3 prototype played wonderfully! Why did they cancel it?)

Trap Gunner for PS1
Gotcha Force for GC

Golden Sun 4. Now.

Burning Rangers