Hours can be spent in just customization alone. That's the original point of this thread. I have made a few teams. A couple of my own creations and the Cleveland Browns. What I have found fun in doing is finding out what NFL players can be used online and which one's can't. Offline, I can use every NFL player. Online, I have to get creative which is actually kind of fun in a strange way.
First off, All of the draft pick and rookie players in the NFL are not blocked in Backbreaker. You can insert Tim Tebow, Sam Bradford and company in the game without being prompted with the online message.
There are also several current NFL players that also do not get the online prompt from the system. On my Browns team. There are several current Browns players that are not blocked. Like Abram Elam, Joshua Cribbs, Jerome Harrison, Mohamed Massoqoi etc etc etc...
On certain players, Simple miss-spelling a name slightly will do the trick. Some are so simple. Linebacker D'Qwell Jackson gets prompted but D"Qwell Jackson or DQwell Jackson does not get prompted by the online message. I like to leave last names alone if I can. Just add an extra N to Sennecca Wallace's name and you are good to go for online play with him.
Team names also work the same way. I like to keep the team's nickname intact and just slightly change the way the team's town is spelled. Cleveland Browns gets a prompt but Clevelend Browns doesn't.
Customization like the game is also hard but it's also very rewarding once you start to work your way around it.
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