How to Pass Castle 2 in Level 7

Run to the right as soon as you enter the level and stop at the large gap. Get close to the edge and wait for the spiked pillar to erupt from the hole. Jump across as it goes back down. Get the Star Coin above you and run to the series of ledges to the right. Jump up to them and wait for the spiked pillar to shoot down from above you.

Jump down to the lower ledge and run to the right before the spiked pillar shoots back down. Continue moving to the right to get to the checkpoint. Keep walking to the right, dodging the spiked pillars, until you get to a pair of Sledge Bros. Kill them and jump past the large spiked pillar.

Look below the platform you are on and make note of the green pipe. Proceed past the pipe to get to some lower platforms and wait for the spiked pillar to recede. Jump to the pipe and use it.

Walk to the right past a small cluster of spiked pillars and collect the second Star Coin in the level. Jump up the platforms and go up through the yellow pipe just above the Star Coin.

Walk to the right and jump past the small cluster of spiked pillars. Keep heading right past a pair of pillars. Watch the cluster of three pillars. Jump across all three just as they start to go back down. Get the item box on this platform, jump on top of it, and then wall-jump up to get the last Star Coin.

Proceed all the way to the right until you get to a lone Sledge Bro. and kill him. Move along the path until you get to a propeller mushroom. Use it to get to the large door, through which you will find Ludwig von Koopa.

Walk down the long corridor to confront Ludwig. Watch his attack pattern and dodge the fireballs he shoots at you by jumping onto the platforms in the arena. Jump onto his head three times to defeat him and collect his key.