Demon is played against the clock. Your score will count down at a rate of 1 point every second. A bonus is awarded if the game is completed. At the start of the game, the bonus is 5000 (4900 for Rule 2) and is reduced at set time intervals. Therefore, the faster you complete the game, the higher your final score should be.

Good Points

Moving a card from the waste pile to the tableau+35 Points
Moving a card from the waste pile to the foundations+80 Points
Moving a card from the tableau to the foundations+80 Points
Moving a card from The Demon to the tableau+140 Points
Moving a card from The Demon to the foundations+200 Points

Bad Points

Every second of elapsed time-1 Point 
Every time Undo is used-25 Points

Completion Bonus

Time 5:50 or longer+2000 Points
Time 5:00 to 5:49+2500 Points
Time 4:10 to 4:59+3000 Points
Time 3:20 to 4:09+3500 Points
Time 2:55 to 3:19+4000 Points
Time 2:30 to 2:54+4500 Points
Time under 2:30+5000 Points
The maximum possible score with a 13 card Demon will be as follows:
13 Demon cards to the tableau (13 x 140 Points)+1820 Points
34 stock or waste pile cards to the tableau (34 x 35 Points)+1190 Points
51 tableau cards to the foundations (51 x 80 Points)+4080 Points
Bonus for achieving this in under 150 seconds+5000 Points
Maximum Possible Score12,090 Points