I haven't finished this game yet but I can already tell it's great. The comedic writing is absolutely fantastic, example being the pre-recorded message of Cave Johnson talking about not taking life's lemons and potato GLaDOS cheering him on. The actual story is good, but not the best since that isn't really the point. Now the big one, the puzzles, they're very challenging and good for growing more brain cells. overall a fantastic game and absolutely a must play.