Use Space along with the other arrow keys except down to use different moves. Every character has different moves! You also use the arrow keys to move and the up key to jump.
Well here it is. I've made a terrible demo awhile back, but here is the real deal. It currently has 17 characters and more are planned to be added in along with much more stages! Vote which characters you want to be added in the the Smash Ballot! NEWS!!! Change log down below. IMPORTANT UPDATE!!! READ ME!!! It's been fun making games on Scratch for 9 years. However, I'm now learning how to use other coding languages. Mainly for now c#. So I won't be making any big Scratch games anymore. I've enjoyed all the positive feedback I got, and the people who keep playing my games. You guys are great! This game will be my last huge project on Scratch unless something unexpected happens that will get me to make games on Scratch again. I'm currently working on a website that will have all my future games for download, and the link will be given out here and to anybody who wants it once its ready. This website will have all my good Scratch games on it and the downloads to all my good games made in the future. I'll still be making some smaller games on here and keep an eye on my profile. CHANGE LOG! 4/7/16 +Meta Knight added! +Bowser added! +CPU can no longer be Lucas due to it being annoying. +PacMan's Fruit Charge has been heavily speed up. 10/16/15 +Duck Hunt's recovery move was added meaning Duck Hunt is officially finished! +CPU no longer constantly jumps on some stages. +PacMan's sprites have been slightly changed. 10/15/15 +Sonic's homing attack was buffed from doing 5 damage to 10, and it also does more knock back. 10/13/15 +Duck Hunt and Duck Hunt stage are not complete! +Sanic is now playable by switching to MLG mode and picking Sonic. 8/26/15 +Shovel Knight has been added as the first original character! +Third Ballot with Link, Samus, and Bowser. 8/13/15 +Donkey Kong added because he won the first ballot. +Hit markers added in MLG Mode! +Second Ballot with Pikachu and Marth still, but a newcomer added!