Is there any way I can play this game alone?
I'm sorry, but the game is designed around there being 2-4 players as there are some puzzles that require at least two players and communicating with each other. The online service provider we use also doesn't allow the same computer to connect twice. Theoretically if you have two computers you could host on one and join with the other and switch between the two when needed, but I can't promise the best experience with that.