Below is a simple side-scrolling game implemented in JavaScript. To see the source code or to make a comment, visit https://thiscouldbebetter.wordpress.com/2014/02/07/a-simple-side-scrolling-platformer-game-in-javascript/.

Use the A and D keys to move left and right, and W or the spacebar to jump. The object is to get from the left side to the right side of the level without getting hit by any of the bad guys.