Wednesday when we first began Sudoku I was fine with it, because I have limited previous experience with this game. The challenge for me during the game I was playing came when I realized several of the cells I completed were incorrect. It would have been helpful for me to have known ahead of time that several of my cell entries were incorrect; especially since I was playing on the entry level.
I did choose to clear that game with the intent to start again, but when I realized it was close to time to wrap up for the day, I then choose not to start again, anticipating rushing through the process would probably be what frustrated me.