I will be clear and concise. The tutorial game lasts forever. I know it's the tutorial game but it should end right? In the game options the end condition is default and it is there that the game would supposedly end in turn 300, but it would also be possible to end the game by completing the technology tree, which I also did, in addition to reaching turn 301. The game it's not over and next to my civ symbol appears "The game ends in (infinity symbol)".

Note - Level of tutorial : Advanced tutorial (I am familiar with strategy games)

I had this happen too on my first game. Maxed tech tree, all the final stars, other win criteria fulfilled. game wouldn't end.