Marathon 2 Serial Numbers for full play:

ad7hxcslzuktydxk
nd7cxeg36uqhysxk
2bsrdzv365qxyvf9
6bted5r3zqks11fl

Serial Numbers for network only (up to 8 players for network)

sds4xzg4zcqspxf9
adttdzt4zcqs1dxp
n1redzrf681x17xl
t97bvzsf2e15pgfb

