[moonfern]

(G)Zdoom can play all wads made for other ports but it's not backwards compatible with wads made for older version of zdoom. And that's a pity besides you have to change many default options to play "doom" like it was. In original doom monsters have infinite height, so you can't walk on monsters,pass under flying monsters. Looking up/down, jumping and making the bfg more powerfull are other changes. Great mods, wads and even indie games have been made with g/zdoom but the topic is the original doom movement. In that context people use mostly prboom + or chocolate doom.