Aw come on, I understand Overlord. I'll try and explain:
Imagine 2 ppl and J2O. On second thought, don't imagine J2O, it exists. One of the ppl has only 1.24 and the other has only 1.23. K? the 1.24 person can use the patch file so his 1.24 JCS creates lvls that the 1.23 guy can play.
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