I was using the platform extension for my game but my character got stuck all the time. So I'll just use a custom platform engine. What is the best custom platform engine avaible with the least bugs. You only need to be able to jump and walk.
You need to use an object that's invisible to the PMO, then set the sprite to always be at it's position. Sometimes, if you set the Sprite to the PMO, as the player object then it will sink into platforms.