Arsenal fell further behind Liverpool in the Premier League title race as they were forced to settle for a point against Brighton.
With new England boss Thomas Tuchel watching on, Ethan Nwaneri lit up the Amex as he netted the opener, though Bart Verbruggen should have done better.
With Bukayo Saka and Kai Havertz still out, Martin Odegaard had to settle for a spot on the bench and his second half introduction was too late for him to have too much of an impact.