Fun fact - that ‘puzzle’ has its difficulty set by your processor’s speed. The game uses a set amount of time to determine the best move for the computer, and plays the best it’s got after that time. On slower processors of the time, it would only be able to calculate so many options before needing to come to a decision, but because it didn’t account for better hardware, the computer can make the best move every single time, causing it to be unwinnable even if the human player also plays perfectly.