To this I'd add: Make tutorials optional!<p>Nothing irks a veteran RPG player more than an NPC's condescending, non-skippable takeover of the controls to show you how to equip an item.<p>And some of us like to replay our games, especially on higher difficulty settings (another thing the guidelines recommend having) -- we don't want the game to talk to us like n00bs if we've already beaten it!<p>Also, many of the suggestions listed under Advanced are rather questionable for games that don't specifically target disabled players.<p>Adaptive difficulty isn't necessarily a good thing. Besides entertainment, people play games because they want to be competitive with others. In single-player games, this competitiveness usually takes the form of comparing achievements, progress or high scores.<p>With adaptive difficulty, your progress in a game ceases to be an objective measure of your ability; thus, adaptive difficulty alienates competitive gamers.