Are you talking about the Super CD Godzilla game? The one with the trivia feature that is timed? Where you can unlock all the kaiju up till Super Mecha-Godzilla? That was a great 2D fighter for it's time. Sure you can beat the game by sticking to a few moves, but thats true of most games. My friends and I use to love to play this game, unlock all the kaiju and have fun going head to head. Battra was real fun with his back-flip-suplex-super-move. It was the best game up till DAMM was released.
The trivia game is hard to master, but the answers are always the same, so if you play through enough you can stop kanji and figure out the answers in time to beat the clock.