The game engine is the Goldsrc engine , the game is my custom half-life mod (Orengi's mod) , the change map transition is meant to be a portal that gos somewhere completely different but i will be making maps that have normal transitions. Yes i have check if the trigger in the first map links with everything in the second. All the map properties are all normal and the dll for the mod is a unmodified hl.dll , so that you know the problem was not caused by me.