Battletoads is a classic game known by all, mainly for its high difficulty. In this game, The Dark Queen has kidnapped Princess Angela and Pimple while the two are on a leisurely trip in Pimple's flying car. After Pimple sends a distress call, Professor T. Bird alerts Rash and Zitz, the remaining two Battletoads, about the situation, and the two heroes are soon off to Ragnarok's World, where the Dark Queen's ship is hidden underneath the planet's surface, to rescue their friends.
So, yeah, when I said this is known for its high difficulty, I mean it. This game only gives you three continues to complete it, and the game has some difficult levels, like the infamous Turbo Tunnel, which most players will be stuck on unless they play this on the Rare Replay, and the Rat Race, which challenges players to race rat enemies, with the next being much faster. The two player mode is not going to do any favors, either, as friendly fire is not only on, but if one player loses all his lives, it cuts to game over, and on continue, both players restart at the beginning, and if continues run out, all it takes is one player to lose all lives to end the game for both).
However, it does have some good gameplay, as the controls are good, and the concept of the heroes' limbs transforming for powerful blows are a neat idea. This may be hard, but this game is worth checking out (just don't play two-player mode).