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If you are on Windows 10 and get boxes in Worms Armageddon or World Party Remastered that you can't get rid of, the solution is simple (credit to UnluckyForSome from Steam). Just right-click on the game's executable file in its directory (WA.exe for Armageddon, w2.exe for World Party Remastered), go to Properties -> Compatibility, and then tick the "Disable fullscreen optimizations" box. Apply, then OK.