It is possible that:
* The game name is slightly different: Perhaps it's "Jungle Rumble" or "Rumble in the Jungle" but produced by a different company.
* You're remembering the wrong company: Maybe it was produced by a different company altogether.
To help me find the correct game and its rules, please provide more information:
* Can you describe the game itself? What are the main mechanics? What are the players trying to do?
* Do you have any images of the game board, pieces, or box?
* Do you remember approximately when you last saw or played the game?
With more details, I can hopefully identify the correct game and find its rules for you.