Some of the best cheat codes for PlayStation 2 are for two of the system's most popular games, "Grand Theft Auto III" and "Need for Speed: Most Wanted," according to CheatCodes.com. Some "Grand Theft Auto III" codes include the Weapon Set 1 cheat, which supplies the player with a variety of weapon choices. Activate the code by completing the following series with the controller: R2, R2, L1, R2, left, down, right, up, left, down, right, up.
A few more useful codes for "Grand Theft Auto III" are the Full Health Code, activated by entering R2, R2, L1, R1, left, down, right, up, left, down, right, up. Also, the Lower Wanted Level cheat is useful to keep the cops at bay. Press R2, R2, L1, R2, up, down, up, down, up, down, during game play to activate it.
Some cheat codes for "Need for Speed: Most Wanted" include the Get $100,000 cheat, accessed by entering R1, L1, up, down, three times. Also, play the game at 100-percent completion by pressing left, right, up (three times), down (four times), left (two times), right (three times), up, down. One other cheat that may be useful is the Unlock All Cars code. Activate this code by entering R1, circle (three times), R1, R2, L2, L1, up, down, L1 (three times). All codes must be entered at the start screen.