Keeping a high score

Hi all, 

I am looking for some advice.  I have created a drag and drop game using a timer.  The aim is to get faster at completing the game each time and I am trying to find a way to keep the high score across retries unless it is beaten. 

I am using %score% and %highscore% and set up a trigger for the 'high score' to change to the 'score' when the 'score' is lower than the 'high score', but even if it is higher it is updating to the score.

I have tried adding a trigger to change the high score value when the timeline starts to 999 if the high score is = 0, which works on the first turn to update the high score to the score, but changes to 999 on the second attempt.  If I disable this trigger it doesn't even show the score on the first attempt.

I am pretty new to Storyline and would greatly appreciate any help.  It's driving me mad!

Thanks in advance :)