Version: 0.2
Date : December 11, 1995
- This is the first release of software for production of sample games.

Version: 1.0 (changes from revision 0.3)
Date : December 11, 1995
- This is the release of software for production.
- Added lamp, display and sound effects.
- Changed coin meter test time to 64ms.
- Changed loop gates to make them raise faster.
- Fixed a player 1/player 2 score overlap.
- Changed plunger to prevent extraneous firing at power up.
- Fixed an incorrect report of gorilla standup switch errors.
- Added Novice Mode. DEFAULT : OFF
- Fixed buy-in adjustment so it does not get turned on when pricing is changed.

Version: 1.1
Date : December 12, 1995
- Fixed a test mode display glitch.

Version: 1.3
Date : January 4, 1996
- Update to apple version 3.54 to provide serial interface support on WPC-95.
- Revised Paramount logo with the words 'A Viacom Company'.

Version 2.0
Date : February 8, 1996
- This release of software facilitates the development of the kit version of the Congo playfield.
- This ROM automatically detects the WPC or WPC-95 hardware and will work with either system.
- Added some sounds to match.
- Added more French adjustment and audit translations.

Version 2.1
Date : October 7, 1996
- Fixed a bug in the ball save adjustment so you can now turn ball saves off.
- Fixed a bug in the attract mode display for multiple replay levels.
- Fixed skill fire display effect.
- Improved plunger initilization at powerup.
- Changed buy-in to allow for more time if money is inserted.
- Improved printer support.