New Super Mario Bros.: 4-Fort

Once again, we have to deal with Bowser Jr. There is lava below the floor in the first area. We have to use the moving stone slabs as stairs to reach the door. In this room, the lava rises, so you have to climb quickly and carefully. Making things a little more difficult is the grates we have to climb. When the path forks, take the grates on the left and flip the grate to reach the first Star Coin. The second Star Coin is higher up, between two Amps. Near the midpoint are stone slabs with spikes. There is a long, horizontal stone slab over smaller slabs. The third Star Coin is over that. There are some Red Coins that require jumping from grate to grate. Keep climbing grates to reach the boss door. Bowser Jr. is wearing his mask with sharp teeth, which means stomping on him is impossible. He will go into his spiky shell if Mario tries to land on him. To defeat him, either use fireballs, or stop the shells he throws and fire them back at him three times to defeat him. Once defeated, he takes Peach to the castle.