While [game developer and retired historian] Dr. Haliczer did not specifically consult any Catholic authorities during his research, the Rev. Godwin Asuquo of the Newman Catholic Student Center said in an e-mail that "in today's world, people use games to teach and some of them could convey good moral and truthful lessons."
He added that Dr. Haliczer could check with a diocesan office for a NIHIL OBSTAT, an official approval by a delegated censor of the Roman Catholic Church to publish a work dealing with faith or morals. This would essentially authenticate in the eyes of the Church the accuracy of the game and its lessons.
The "Nihil Obstat" and "Imprimatur" are official declarations that a book or pamphlet is free of doctrinal or moral error. No implication is contained therein that those who have granted the Nihil Obstat and the Imprimatur agree with the content, opinions or statements expressed.(I sometimes wish for a good Hymnal Gothic typeface on Blogger to set quotations such as the above.)
The explanation goes on to suggest that in some minds, there is the equivalent of grade inflation in the issuance of imprimata.
When buying books on religious and spiritual matters, seek out those books written before Vatican II and which have the "Imprimatur," or those books which are known to be written by solidly orthodox traditional Catholics. Otherwise, be wary and take the book with a grain of salt.