Steps:

Go to Jetpack Joyride > Utilities [You must be registered and logged in to see this link.]
Open Cheat Engine
Click mini cpu icon at the top left of cheat engine or the small box under file tab
Select -plugin_container.exe(firefox) or FlashPlayerPlugin_11 (Watch: how to find correct process for google chrome - Click here)
Value type '4 bytes'
Scan '25000' (Quick Revide (3 pack)
Double click the result or click the 1st address, hold shift and then click the last address
Click the red arrow
Change all the values to '-10000000'
Click BACK and then Click UTILITIES to change the value to FREE
Click BUY (your money will become 10m)
HAVE FUN!!!