Been playing The Talos Principle, because everyone keeps saying that Portal fans absolutely love this game. While the puzzles are every bit as good as Portal, the jokes, sarcasm and the banter is what made Portal stand out. Puzzles were only a part of the puzzle (see what I did there?). Talos principle follows a different theme (mythology/philosophy), which is great in its own right, but definitely a level below Portal as an overall package. I'd give it a 7.5 or 8 on 10.