So... is Deadman Wonderland finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: July 03, 2011
Manga finished: July 26, 2013
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
Ganta Igarashi's ordinary life is shattered when his entire class is brutally murdered, and he's wrongly accused and sentenced to Deadman Wonderland, a bizarre prison theme park.
Instead of a simple prison sentence, Ganta is thrust into a deadly game for survival, where inmates are forced to participate in dangerous and often lethal activities to earn points that delay their execution.
He must navigate the treacherous prison environment, filled with dangerous convicts and those who possess strange abilities, all while trying to prove his innocence and uncover the identity of the mysterious "Red Man" responsible for the massacre.
His every move is a gamble, as he struggles to survive in a place where trust is a luxury and death is always a looming threat.