We have 3 cheats and tips on iPhone. If you have any cheats or tips for Contract Killer please send them in here.
You can also ask your question on our Contract Killer Questions & Answers page.
If you go to your date/time settings and change them 1 hour forward your energy will be fully restored when you return to Contract Killer.
If you go to the settings and change the time to 11:59 pm and wait till it turns to 12:00 am you will get a your daily bonus. Keep repeating to get money quicker.
The contracts are pretty easy early in the game so whenever there is the challenge to get a faster kill to get more Experience Points take it up.