From Josh Morony comes this new 2500 word tutorial: "I remember playing quite a few simple platformer games when I was younger where you would basically have platforms running vertically down the screen, each with a space somewhere to get up to the next level, and you would have to try and climb up the platforms before you hit the bottom.
As I’ve mentioned in the past I like simple games with an interesting or novel gameplay mechanic, so I wanted to create a game based on this concept with a little bit of a twist. I will be doing that shortly, but first I wanted to get the basic mechanic down and I ended up with a simple game that looks like this:
In this tutorial I’m going to show you how you can create this simple, infinite climbing game. All the platforms are randomly generated so the game will go on forever until the player hits the bottom."