This is about the Virtual Boy game of Mario Clash. For the microgame with the same name, see here.
Mario Clash is a video game released on the Virtual Boy in 1995. It is the first of two Mario games to be released on the unsuccessful console/handheld (not including Wario Land VB). The game is somewhat of a sequel to the arcade hit Mario Bros., as the main goal of the game is to destroy enemies underground inside a pipe. However, unlike Mario Bros., you must kill these enemies by using Koopa Troopa shells that are next to you. The objective of the game is to knock out every enemy on the other side.
Koopa Troopa - These enemies are known by many as the most popular Mario enemy. They are turtle like creatures. There will always be two Koopa Troopas on the platform that Mario is standing on. Mario must jump on it to make him withdraw into his shell, then you can take his shell and throw it at the enemy. Once you throw the shell, another Koopa Troopa will pop out.
Spike - The weakest enemy. He looks similar to a Koopa Troopa, though he has a spike. In the main series, these enemies would be thrown by Lakitus.
Thorny - This enemy is similar to Spike, though he is stronger. You must hit him twice until he is defeated.
Para-Goomba - Para Goombas are Goombas that have the ability to fly (though all they really do is jump). Like Thorny, you must hit him twice before he is dead.
Lobb - This enemy has the ability to strike back at Mario. Other than that, it also takes two hits until he dies.
Sidestepper - Fans of Mario Bros. should recognize this enemy. He is a crab like creature that takes three shots until he is defeated.
Big Boo - This Super Mario Bros. 3 enemy will turn invisible for a few seconds, then will turn back to his regular state, which is vulnerable. You must hit him twice to kill him.
Snake - Snakes are enemies that will lay eggs to create more snakes. You must harm the snake twice to kill it.
Pokey - This enemy is a cactus with three different sections, each one on top of the other. To defeat this enemy, attack it's lower sections, then it's head.
Fire - A fire ball that can be destroyed with a single hit.
Ice - An icicle that can be destroyed with a single hit.