Loading a 2d minigame in my 3d game

So I have a 3d game but I want to load a 2d minigame to overlay on my 3d scene when I touch an object in the 3d game. I have gotten as far as to load a level stream of the 2d game into the 3d game however the 2d game comes in with 3d perspective.

this is exactly what i want to happen. You touch an object in your 3d game, and the 2d mini game shows up on the left and you can then interact with the mini game.

Any help on this would be really helpful I have searched around and haven’t found anything on this subject,