Sweet Heaven is the seventh world in New Super Mario Bros. X-treme. It is sky themed. The boss is Ludwig. This world resembles Sweet Sweet Canyon in MK8.
7-1: Beanstalk Canyon
A mountain level with a beanstalk that advances to the clouds.
7-2: Fuzzy Mushrooms
A sky level with Fuzzys and moving mushrooms
7-3: Manta Raid
Another sky level with Mantas and Bullet Bills
7-Ghost: Vanishing Mansion
A ghost level with disappearing blocks
7-Fortress: Lakithunder's Hurricane Fortress
A stormy level with lighting and Banzai Bills
7-4: Parabeetle Parade
A sky level with Parabeetles.
7-5: Smelly Factory
A factory level with nuclear clouds and Mechakoopas.
7-6: Snake Block Sunset
The last sky level. It is on a green snake blocks and Foos, and Sledge Bros.
7-Castle: Ludwig's Cloudy Castle
The last Koopaling castle. It has Spike Pillars and Amps. The boss is Ludwig.
He acts just like in NSMB. But he makes a electric ray after 2 hits.
Ludwig Von Koopa
The first phase is he flies in a Lakitu cloud shooting lighting and chucking Bob-ombs. The second phase is him shooting homing fireballs, ground pounds, and make lighting bolts.