To go along with the strictly standard graphics and sound,
Rock 'Em Sock 'Em Robots: Arena offers strictly standard gameplay. While there are a few nifty features that make the game unique, and a few characters and upgrades to unlock, in the end
Arena doesn't stand up to other, more solid fighters on the PSX.
There are three major play modes in Arena. The first is your standard Versus mode, where you duke it out with a computer-controlled robot or one that your friend is in charge of. This is old-fashioned fighting at its finest. As you beat upgraded bots in Career mode, their upgrades appear in this mode, but that's the limit to the customization of the fighters. Simple, light fare, the Versus mode will likely not keep you entertained for long.
The real core of the game comes in the Career mode. You start out at the bottom of the ladder, and you've got to fight your way to the top. There are three official Leagues that you can fight in, and you start in the Bronze. As you defeat your opponents, you have a chance of ripping body parts off and using them for your own or buying new parts with your prize money. This lets you tinker with your robot and make it more to your style, which is a nice feature.
Of course, as you progress in the Career mode, you'll fight robots that have 'non-standard' parts as well. Part of the game is learning to adapt. There are four different combat 'types', and every robot is strong or weak in different ones. Interestingly enough, the weaker you are to a damage type, the more damage you deal of that type. It's an intriguing system, and its effects are quite obvious once you start switching parts around. Getting the right parts for the job is often half of the challenge of the game.
The arena combat itself is pretty much standard fare. You can run around, a la Tobal, and you can block with a different shoulder button. There are two throw buttons, but one generally doesn't work until you've upgraded your robot. These throws can be difficult to land, and it sometimes seems random as to whether they'll work or not.
And randomness of this sort is perhaps Arena's greatest flaw. I've fought robots and trounced them in a matter of seconds. In a rematch immediately afterwards, I can't get a single attack in. The AI is all over the map, sometimes tearing you a new hole, and sometimes doing next-to-nothing to keep you from wailing on them. Sometimes constant projectile attacks will defeat your opponent with little fuss or muss; other times, no amount of wily playing will keep you from getting your butt kicked.
The last play mode is Stakes Mode, which requires two people to have careers. You basically play for parts, which can be daunting if you've spent much money on your robotic whizzigigs and doodads. This mode will probably get the least use in Arena, although it's certainly imaginative.
And, despite any generic qualities of the game, it sure does have a good (if juvenile) sense of humour. Reading the information text for each weapon can be very amusing, and some of the part names are quite funny. (Uranus Kicker? -snicker-) The robot descriptions in the instruction book are amusing as well. This sort of lighthearted humour is the thing that characterizes nostalgic games like Arena, and is definitely put to good use in the game.