What are the top LitRPG books of all time?

Once you’ve been bitten by the LitRPG bug, you’ll want to keep reading works in the genre. And the good news is that there are hundreds of LitRPG titles to choose from. So many, in fact, that a common question in forums is to ask what are the best LitRPG books ever? Here’s my own answer to that question. Of course, it is highly personal and I don’t claim some kind of objective authority. But these are the ones that I enjoyed reading, that are well written, have engaging characters, strong plots and, of course, a game or game-world in which the drama unfolds.