One of the unwritten rules of the Super Mario Bros. titles (heck, of any decent video game, really) is that the environments in which the protagonist finds him or herself be passable according to the game's internal logic.  If Mario can jump a maximum distance of X, then the bottomless pits that separate him from Princess Peach cannot be larger than X unless the game provides an alternate way of moving beyond the pit.  Over at Brawl in the Family we see what happens when Bowser fights dirty and tries to hold Mario back with an extra wide hole in the ground.  Just how resourceful is everyone's favorite plumber?  To what lengths will he go to save the princess?  And just how bottomless are those supposedly endlessly deep gaps?