I installed and played the game Back to the Future III. It works fine on Dosbox, especially after turning the music off and decreasing the speed. Unfortunately, I find it impossible to finish the game. The fourth and last level is way too difficult.

There are many URL containing cheats, but I can't use them. For instance: to enter the codes rotten cheat (level 1), lousy cheat (level 2) and low down cheat (level 3) - but they never work for me. I try to enter them while the game is running or at pause or during the intermission story, using capital letters or not, but nothing works.

Another cheat is to down A (or 1) and press Up, Down, Left, Right. This doesn't work either. I tried this in both arrow keys consoles on the keyboard.

Did anyone manage to make those cheats work? If so, please tell me what exactly am I doing wrong.