Robo Pit (ロボピット) is a robot fighting game released in 1996 for PlayStation and Sega Saturn. The game was developed by Altron and published by Kokopeli Digital Studios outside Japan. A sequel, Robo Pit 2, was released in Japan on PlayStation in 1997. It was also released in Europe and North America in 2003.
The rules of Robo Pit is to build a robot and then try to fight your way to the top in arenas that are square in shape. There are many different types of arenas and the time of day can vary. As you fight your way to the top there are bosses that you will fight along the way.
There are various types of weapons which include The Axe, Lips, Sword, Missile and Claws as well as many more. There are also body part (Head, Body, and Legs) that have different stats that affect your bot's performance. Although all body part are available from the start, the only way to unlock more weapons is to fight more robot enemies. https://en.wikipedia.org/wiki/Robo_Pit