1. I beat the game and at the end it said "To beat the game you need to buy it. And it said I had to pay $40. I'm not familiar with Doom beyond this game but apparently there are 3 parts. Since the entire Doom game is free now ( i think ID released it for free since it's so old) why doesn't the author add the 2 other chapters?)
2. It says it can do Doom 1 and Doom 2 but Doom 2 is not there. Where would I get Doom 2?