Tools

  * CE - CE -Cheat Engine 5.5 [Link1]
  * FP10 - Flash Player 10 [Link1]
  * Firefox 3.5

Steps:

  1. Go into Pet Society [click to play]
  2. Play a game of Ball with your pet.
  3. After about 5 hits, you can stop. 
  4. In Cheat engine, attach firefox as process, [tick HEX, ASROM, Array of Bytes]
  5. Scan "83C0018BD18B4F548975A489"
  6. 1 address returned. Right click > Disassemble
  7. You will see the code "add eax,01"
  8. Change it to "add eax,1E" 
  9. Right click the same code and select "Change register at this location"
  10. Tick EAX and paste this as the value "668a0"
  11. Click OK
  12. Now play Ball with your pet again. Notice you will instantly get a high score.