Twisted Metal 2 Codes (PSX)

Twisted Metal 2 (known in Europe as Twisted Metal 2: World Tour) is the second game in the Twisted Metal vehicular combat series. It was developed by the game studio SingleTrac, published by Sony, and released in 1996 for Playstation and PC. The PC version features slightly cut-down graphics compared to the PlayStation version (minor details of some levels disappeared) but it doesn't require a 3D accelerator video card and plays well on weak computers. It also features multiplayer mode over a modem line or Internet.

A feature of Twisted Metal 2 which was not seen in the first game is the Advanced Attacks. These are special maneuvers/attacks that provide advantages to all vehicles. The feature was incorporated into future installments of the Twisted Metal series. Two years after its release, Twisted Metal 2 was re-released as a PlayStation Greatest Hits game. A similar title was released in Japan in 2007. On November 1, 2007, it was also released for download in North America on the Playstation Network. (Wikipedia)

Codes

Hidden 2 Player Levels
Enter the following at the 2 player level select screen:

Down, Up, L1, R1 - Cyburbia

Up, Down, Right, R1 - Jet Moto track

Down, Left, R1, Down - Rooftops

In-Game Cheat Codes
Enter any of the following codes during the game (not paused) for the desired effect.

Right, Left, Down - Drop Mine code

Left, Right, Up - Freeze Burst Code

Up, Up, Left - High Jump

Hold L2 + R2, press Up, Down, Left, Right, Right, Left, Down, Up - Infinite Weapons + Turbo

Hold L1 + R1, press up, down, left, right, right, left, down, up, release L1 + R1 (code must be entered quickly) - Invincibility

Hold R2, press Up, Down, Left, Right, Right, Left, Down, Up - Mega Machine Gun

Right, Left, Up - Napalm Code

Left, Right, Down - Rear Attack

Right, Down, Left, Up - Temporary Invisibility

Up, Up, Right - Temporary Shield

Misc. Codes
During the game press Down, Up, Right, Left, Up, Up, Down, Down - Health boost (note: you will lose all your weapons, and this only works if your advanced attack bar is full)

Highlight napalm, hold L2 and press Up, Down, Down, Left, Left, Left, Right, Right - Homing Napalms

Select Axel, hold R1 and then during the game press Up, Down, Left, Right, Right, Left, Down, Up - Massive Damage (ram your opponents)

At the vehicle select screen press L1, Up, Down, Left - Minion

At the vehicle select screen press Up, L1, Triangle, Right - Sweet Tooth

Hold the machine gun button and press Up, Down, Up, Up - Use Minion's weapon with any character

Here's a mega bug in the game: