> An ideal game would be hard enough for everyone, yet everyone would be able to beat it. That seems to hold very little replayability value. A better prospect

> An ideal game would be hard enough for everyone, yet everyone would be able to beat it. That seems to hold very little replayability value. A better prospect is to make the game just a little more difficult that the current player's skill level, and adapt to that, so the game gets progressively more difficult as the player's skill improves, and the rewards/achievements are in line with that path. (It's quite a oft-given piece of advice for players wanting to get better at chess, that they play people a little stronger than themselves, and they gradually adapt and start winning more than losing) I guess that's what's changed in gaming since the eighties. Back then the challenge and difficulty of games was a feature. Only a small crop of people completed them, the rest of us enjoyed the challenge of trying to get there. Where the journey to improvement is of more value than reaching the credits at the end.