mario and luigi are battling on a bridge with lava below. It all started when mario began to get all the fame for saving the mushroom kingdom from bowser along with his twin brother luigi, luigi was begining to get jealous of mario getting the spotlight one day he ended up joining the king of the koopas bowser. when mario went off to stop bowser and save peach he walked inside this castle he walked through it and came across a bridge with lava at the bottom where he spoted luigi mario thought that luigi was here to help him but luigi said to mario you thought the koopa worked alone and attacks mario. Mario is in shock he never thought that his own brother would betray him so mario and luigi ends up fighting on the bridge.