I don't say any of this to criticize the creator as this is a pretty old game and they probably don't even look at it anymore, but more as a warning for people who stumble onto it. Do NOT play the concept version. I have well above the minimum requirements and after probably thirty minutes of slogging through the intense lag to get to the top of the mountain, it crashed my computer. It's just not optimized well at all. That said, I did download the no grass version and it was really fun and a bit nostalgic running around bob-omb battlefield. The physics and controls were damn near perfect.