It allows the character to grow very big in size and flatten other players . The `` POW BLOCK '' from Mario Bros. allows the character to send a shockwave to all the players in front of them , spinning them out of control and making them drop any items they may be carrying ( there is no effect , however , on those who are airborne ) . New items from Mario platform games are introduced , including the `` Mega Mushroom '' from New Super Mario Bros. , which allows the character to grow enormous in size and flatten opposing characters , and the `` POW BLOCK '' from Mario Bros. , which allows the character to send a shockwave to all the characters in front of them , spinning them out of control and causing them to drop any items they may be carrying ( there is no effect , however , on those who are airborne ) .