"Let's Play Cat Mario | 01 | The Cruelness begins" and related video can be found in Youtube.
This video is introduced by friend about many funny and unexpected scenario in modified Mario game - Cat Mario, such as killer Star, poison mushroom, invisible blocks and triple killer ceilings. In short, it will change your mind when you play Mario next time.
After watching these video, I think I am not going to play Cat Mario simply because I seldom play game (any game). But, it cannot be denied that Cat Mario really quite creative. This game is not suitable for impatient person. However, watching the video from other players can definately make you have a laught.