There is an interesting strategy on how to guess 3 of the 4 numbers on the Play 4. It doesn't work all of the time but the 75% of the time that I kept testing it, it seems to work within 1-10 draws. What you do is look at the winning numbers from the drawing.
Example:
On 4/8 the winning numbers were 8723 (evening draw)
What you do is add 5 to the first number and then add 2 to the last number:
8-7-2-3 (winning number)
+5 +2
-----------------
8 + 5 = 13 (If the number is 10 or more, just use the last digit. So in this case it's 3)
and
3 + 2 = 5
Combine the two numbers (3 and 5). So you have 35
Then you write the winning number again:
8-7-2-3
This time though, you add 5 to the last number (Do this step first) and then add 2 to the first number
So it's
8-7-2-3
+2 +5
-------
3 + 5 (Don't forget, You add the last number first) = 8
and
8+ 2 = 10 (If it's 10 or more, you just use the last digit. So in this case it's 0)
Combine the two numbers (8 and 0). So you have 80
Now combine the two sets of numbers that you made (35 and 80). So you now have 3580. Guess which 3 of these numbers will appear in 1-10 days and for the 4th number, you got to just guess.
On 4/16 the winning numbers were 1580(midday draw). The numbers won't always be in the same order. For example it could have been 5108.