Opprinnelig skrevet av Buu342 (Off for the Holidays).:You dont. This is doom, way back when you couldn't look up and down. But if you still want to use the mouse, you can get a sourcepot to run the game's WAD file. I suggest Skulltag or Zandronum.
Opprinnelig skrevet av HeX9109:Buu342, Doom has always had mouse support even when it was first released. It should work in DOSbox (as it works for me like I said)