Worst-case scenario: the UEd Goblin wipes the map and burns down your house.
Legacy:ChallengeDMP
From Unreal Wiki, The Unreal Engine Documentation Site
ExTReMe: Please expand on this page with classes ETC... I'm just going quick through and filling in gaps.
It appears all this gametype does is turn rating and challenge mode on, turn timelimit off, and set all weapons to stay on players...