So i want to add some props (objects) to my game and i can see them on preview mode but when i actually play the game on play mode i cannot see it anywhere. Any fixes for this?
Do you mean you can see them in the editor, but not when you press play?
Is it a collision / physics issue? ( the objects are thrown out of the play area ).
Give one of them a recognizable name, press play, press F8 and then look for it in the world outliner. Select it in the outliner, and then press F, it will take you to the object.